Java中字符串根据宽度(像素)换行的问题-APISpace

Java中字符串根据宽度(像素)换行的问题

目录java 字符串根据宽度(像素)换行根据像素宽度进行换行Java字符串根据宽度(像素)进行换行及Pdf合并1、工具类最终版前奏2、工具类最终版3、项目中具体使用3.1 controller层3.2 serviceImpl层4、工具类补充

Java 字符串根据宽度(像素)换行

在一些场景下，我们经常会通过判断字符串的长度，比如个数来实现换行，但是中文、英文、数字、其实在展示的时候同样长度的字符串，其实它的宽度是不一样的，这也是们我通俗意义上说的宽度(像素)

根据像素宽度进行换行

需求：

/**

* 10、自己做图片，根据文本宽度进行换行

@Test

public void creatMyImage(){

//整体图合成

BufferedImage bufferedImage = new BufferedImage(500, 500, BufferedImage.TYPE_INT_RGB);

//设置图片的背景色

Graphics2D main = bufferedImage.createGraphics();

main.fillRect(0, 0, 500, 500);

String text = "111122223所以比传统纸巾更环保3334441比传统纸巾更环11111111111111122223所以比传统纸巾更环保3334441比传统纸巾更环11111111111111122223所以比传统纸巾更环保3334441比传统纸巾更环11111111111111122223所以比传统纸巾更环保3334441比传统纸巾更环11111111111";

Graphics2D textG = bufferedImage.createGraphics() ;

textG.setColor(new Color(37,37,37));

Font hualaoContentFont = new Font("PingFang SC", Font.PLAIN, 20);

textG.setFont(hualaoContentFont);

textG.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);

drawString(textG,text,30,100,4,10,50,true,false);

//存储到本地

String saveFilePath = "/Users/healerjean/Desktop/new.png";

saveImageToLocalDir(bufferedImage, saveFilePath);

}

/**

* @param g

* @param text 文本

* @param lineHeight 行高（注意字体大小的控制哦）

* @param maxWidth 行宽

* @param maxLine 最大行数

* @param left 左边距 //整段文字的左边距

* @param top 上边距 //整顿文字的上边距

* @param trim 是否修剪文本（1、去除首尾空格，2、将多个换行符替换为一个）

* @param lineIndent 是否首行缩进

public static void drawString(Graphics2D g, String text, float lineHeight, float maxWidth, int maxLine, float left,

float top, boolean trim, boolean lineIndent) {

if (text == null || text.length() == 0) return;

if(trim) {

text = text.replaceAll("\\n+", "\n").trim();

}

if(lineIndent) {

text = "　　" + text.replaceAll("\\n", "\n　　");

}

drawString(g, text, lineHeight, maxWidth, maxLine, left, top);

}

/**

* @param g

* @param text 文本

* @param lineHeight 行高

* @param maxWidth 行宽

* @param maxLine 最大行数

* @param left 左边距

* @param top 上边距

private static void drawString(Graphics2D g, String text, float lineHeight, float maxWidth, int maxLine, float left,

float top) {

if (text == null || text.length() == 0) return;

FontMetrics fm = g.getFontMetrics();

StringBuilder sb = new StringBuilder();

for (int i = 0; i < text.length(); i++) {

char c = text.charAt(i);

sb.append(c);

int stringWidth = fm.stringWidth(sb.toString());

if (c == '\n' || stringWidth > maxWidth) {

if(c == '\n') {

i += 1;

}

if (maxLine > 1) {

g.drawString(text.substring(0, i), left, top);

drawString(g, text.substring(i), lineHeight, maxWidth, maxLine - 1, left, top + lineHeight);

} else {

g.drawString(text.substring(0, i - 1) + "…", left, top);

}

return;

}

g.drawString(text, left, top);

}

Java字符串根据宽度(像素)进行换行及Pdf合并

实际开发中，我们经常会通过判断字符串的长度，比如个数来实现换行，但是中文、英文、数字在展示的时候同样长度的字符串，其实它的宽度是不一样的，这也是们我通俗意义上说的宽度(像素)。

下面结合jasper套打打印业务来说明。

1、工具类最终版前奏

package main;

import java.awt.Color;

import java.awt.Font;

import java.awt.FontMetrics;

import java.awt.Graphics2D;

import java.awt.RenderingHints;

import java.awt.image.BufferedImage;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

import javax.imageio.ImageIO;

import javax.imageio.stream.ImageOutputStream;

public class SubstringStr {

/**

* 1、自己做图片，根据文本宽度进行换行

public void creatMyImage(String text) {

// 整体图合成

BufferedImage bufferedImage = new BufferedImage(595, 842, BufferedImage.TYPE_INT_RGB);

// 设置图片的背景色

Graphics2D main = bufferedImage.createGraphics();

main.fillRect(0, 0, 1500, 2600);

Graphics2D graphics2d = bufferedImage.createGraphics();

graphics2d.setColor(new Color(37, 37, 37));

Font hualaoContentFont = new Font("宋体", Font.PLAIN, 20);

graphics2d.setFont(hualaoContentFont);

graphics2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);

drawString1(graphics2d, text, 30, 500, 28, 71, 20, false, false, 0);

// 存储到本地

String saveFilePath = "D:\\new.png";

saveImageToLocalDir(bufferedImage, saveFilePath);

}

private void saveImageToLocalDir(BufferedImage img, String saveFilePath) {

try {

//bufferedimage 转换成 inputstream

ByteArrayOutputStream bs = new ByteArrayOutputStream();

ImageOutputStream imOut = ImageIO.createImageOutputStream(bs);

ImageIO.write(img, "jpg", imOut);

InputStream inputStream = new ByteArrayInputStream(bs.toByteArray());

long length = imOut.length();

OutputStream outStream = new FileOutputStream(saveFilePath);

//输出流

byte[] bytes = new byte[1024];

long count = 0;

while(count < length){

int len = inputStream.read(bytes, 0, 1024);

count +=len;

outStream.write(bytes, 0, len);

}

outStream.flush();

inputStream.close();

outStream.close();

} catch (Exception e) {

e.printStackTrace();

}

/**

* @param graphics2d

* @param text 文本

* @param lineHeight 行高（注意字体大小的控制哦）

* @param maxWidth 行宽

* @param maxLine 最大行数

* @param left 左边距 //整段文字的左边距

* @param top 上边距 //整段文字的上边距

* @param trim 是否修剪文本（1、去除首尾空格，2、将多个换行符替换为一个）

* @param lineIndent 是否首行缩进

public static void drawString1(Graphics2D graphics2d, String text, float lineHeight, float maxWidth, int maxLine, float left,

float top, boolean trim, boolean lineIndent, int resultLine) {

if (text == null || text.length() == 0)

return;

if (trim) {

text = text.replaceAll("\\n+", "\n").trim();

System.err.println("执行了。。。。");

}

if (lineIndent) {

text = "　　" + text.replaceAll("\\n", "\n　　");

System.err.println("执行了=====");

}

drawString2(graphics2d, text, lineHeight, maxWidth, maxLine, left, top, resultLine);

}

/**

* @param graphics2d

* @param text 文本

* @param lineHeight 行高

* @param maxWidth 行宽

* @param maxLine 最大行数

* @param left 左边距

* @param top 上边距

private static void drawString2(Graphics2D graphics2d, String text, float lineHeight, float maxWidth, int maxLine,

float left, float top, int resultLine) {

if (text == null || text.length() == 0) {

return;

}

FontMetrics fm = graphics2d.getFontMetrics();

StringBuilder sb = new StringBuilder();

for (int i = 0; i < text.length(); i++) {

char strChar = text.charAt(i);

sb.append(strChar);

int stringWidth = fm.stringWidth(sb.toString());

if (strChar == '\n' || stringWidth > maxWidth) {

if (strChar == '\n') {

i += 1;

System.out.println("\n字符串内容为：" + text.substring(0, i));

}

if (maxLine > 1) {

resultLine = resultLine + 1;

System.err.println("\nif中字符串内容为：" + text.substring(0, i));

graphics2d.drawString(text.substring(0, i), left, top);

drawString2(graphics2d, text.substring(i), lineHeight, maxWidth, maxLine - 1, left, top + lineHeight, resultLine);

} else {

System.err.println("\nelse中字符串内容为：" + text.substring(0, i));

graphics2d.drawString(text.substring(0, i - 1) + "…", left, top);

}

return;

}

System.err.println("最后字符串内容为：" + text + "===行数为：" + resultLine);

graphics2d.drawString(text, left, top);

}

public static void main(String[] args) {

String text = "111122223所以比传统纸巾更环保3334441比传统纸巾更环11111111111111122223所以比传统纸巾更环保3334441比传统纸巾"

+ System.getProperty("line.separator") + "更环66666666"+ System.getProperty("line.separator")

+ "所以比传统纸巾更环保3334441比传统纸巾更环。。。。。。。"

+ "111111122223所以比传统纸巾更环保3334441比传统纸巾更环11111111111";

SubstringStr test = new SubstringStr();

test.creatMyImage(text);

System.out.println("输入图片完成：D:/new.png");

}

2、工具类最终版

package com.sinosoft.emr.util;

import java.awt.Color;

import java.awt.Font;

import java.awt.FontMetrics;

import java.awt.Graphics2D;

import java.awt.RenderingHints;

import java.awt.image.BufferedImage;

import java.util.LinkedHashMap;

import java.util.Map;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class SubstrUtil {

private static int index = 0;

/**

* 1、自己做图片，根据文本宽度进行换行

public static Map creatMyImage(String text, Font font, int appointRow, Map map, int rows) {

index = 0;

// 整体图合成

BufferedImage bufferedImage = new BufferedImage(595, 842, BufferedImage.TYPE_INT_RGB);

Graphics2D graphics2d = bufferedImage.createGraphics();

graphics2d.setColor(new Color(37, 37, 37));

graphics2d.setFont(font);

graphics2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);

map = myDrawString(graphics2d, text, 30, 500, appointRow, 71, 20, map, rows);

return map;

}

/**

* 2、根据宽度截取字符串

* @param graphics2d

* @param text 文本

* @param lineHeight 行高

* @param maxWidth 行宽

* @param maxLine 最大行数

* @param left 左边距

* @param top 上边距

private static Map myDrawString(Graphics2D graphics2d, String text, int lineHeight, int maxWidth,

int maxLine, int left, int top, Map map, int rows) {

if (text == null || text.length() == 0) {

return map;

}

FontMetrics fm = graphics2d.getFontMetrics();

StringBuilder sb = new StringBuilder();

for (int i = 0; i < text.length(); i++) {

char strChar = text.charAt(i);

sb.append(strChar);

int stringWidth = fm.stringWidth(sb.toString());

int strLength = text.substring(0, i).length();

if (strLength >= 53 || strChar == '\n' || stringWidth >= maxWidth) {

if (strChar == '\n') {

i += 1;

// System.out.println("字符串内容为：" + text.substring(0, i));

}

if (maxLine > 1) {

rows = rows + 1;

// System.err.println("if中字符串内容为：" + text.substring(0, i));

char value = ' ', value1 = ' ';

try {

value = text.substring(i).charAt(0);

value1 = text.substring(i - 1).charAt(0);

} catch (Exception e) {

/*e.printStackTrace();*/

System.err.println("----" + e.getMessage());

}

if (isChinesePunctuation(value) && checkCharCN(value1)) {

map.put("row" + rows, text.substring(0, i - 1));

myDrawString(graphics2d, text.substring(i - 1), lineHeight, maxWidth, maxLine - 1, left, top + lineHeight, map, rows);

} else {

map.put("row" + rows, text.substring(0, i));

myDrawString(graphics2d, text.substring(i), lineHeight, maxWidth, maxLine - 1, left, top + lineHeight, map, rows);

}

index = index + i;

map.put("index", index);

// System.err.println("---下标" + index);

} else {

rows = rows + 1;

map.put("row" + rows, text.substring(0, i));

// System.err.println("else中字符串内容为：" + text.substring(0, i));

index = index + i;

map.put("index", index);

}

return map;

}

return map;

}

// 2.1 判断字符是否是中文

public static boolean checkCharCN(char c) {

String s = String.valueOf(c);

String regex = "[\u4e00-\u9fa5]";

Pattern p = Pattern.compile(regex);

Matcher m = p.matcher(s);

return m.matches();

}

// 2.2 判断字符是否是中文标点符号

public static boolean isChinesePunctuation(char c) {

Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);

if (ub == Character.UnicodeBlock.GENERAL_PUNCTUATION || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION

|| ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS

|| ub == Character.UnicodeBlock.CJK_COMPATIBILITY_FORMS

|| ub == Character.UnicodeBlock.VERTICAL_FORMS) {

return true;

} else {

return false;

}

/**

* 3、针对jasper中宽度较短的文本

* @author wanglong

* @date 2020年11月10日下午7:12:14

public static Map creatShortImage(String text, Font font, int appointRow, Map map, int rows) {

index = 0;

// 整体图合成

BufferedImage bufferedImage = new BufferedImage(595, 842, BufferedImage.TYPE_INT_RGB);

// 设置图片的背景色

Graphics2D main = bufferedImage.createGraphics();

main.fillRect(0, 0, 595, 842);

Graphics2D graphics2d = bufferedImage.createGraphics();

graphics2d.setColor(new Color(37, 37, 37));

graphics2d.setFont(font);

graphics2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);

map = myDrawShortString(graphics2d, text, 30, 230, appointRow, 71, 20, map, rows);

return map;

}

// 3.1

private static Map myDrawShortString(Graphics2D graphics2d, String text, int lineHeight, int maxWidth,

int maxLine, int left, int top, Map map, int rhttp://ows) {

if (text == null || text.length() == 0) {

return map;

}

FontMetrics fm = graphics2d.getFontMetrics();

StringBuilder sb = new StringBuilder();

for (int i = 0; i < text.length(); i++) {

char strChar = text.charAt(i);

sb.append(strChar);

int stringWidth = fm.stringWidth(sb.toString());

if (strChar == '\n' || stringWidth > maxWidth) {

if (strChar == '\n') {

i += 1;

//System.out.println("字符串内容为：" + text.substring(0, i));

}

if (maxLine > 1) {

rows = rows + 1;

//System.err.println("if中字符串内容为：" + text.substring(0, i));

map.put("row" + rows, text.substring(0, i));

map.put("row_len" + rows, stringWidth);

myDrawShortString(graphics2d, text.substring(i), lineHeight, maxWidth, maxLine - 1, left, top + lineHeight, map, rows);

} else {

rows = rows + 1;

map.put("row" + rows, text.substring(0, i));

map.put("row_len" + rows, stringWidth);

//System.err.println("else中字符串内容为：" + text.substring(0, i));

}

return map;

}

return map;

}

public static void main(String[] args) {

Map map = new LinkedHashMap<>();

int rows = 0;

int appointRow = 4;

Font font = new Font("宋体", Font.PLAIN, 12);

String text = "111122223所以比传统纸巾更环保3334441比传统纸巾更环11111111111111122223所以比传统纸巾更环保3334441测试数据"

+ System.getProperty("line.separator") + "在仿苹果官网垃圾桶时，设计出的UI使用PingFang SC 字体"+ System.getProperty("line.separator")

+ "天津市防控指挥部消息称,经排查,滨海新区中新天津纸巾更环保3334441比传统纸巾更环666所以比传统纸巾更环保3334441比传统纸巾更环8888";

int length = text.length();

map = creatMyImage(text, font, appointRow, map, rows);

if (length > index) {

System.out.println("还剩余文本：" + text.substring(index));

}

System.out.println("\n<<--->>>rows=" + rows + ", map="+map);

}

说明：此工具类我们经理进行了改造，生成的文本内容符合中国人的书写习惯：行首不能是标点符号。如果行首是标点符号，上一行的最后一个文字会挪至本行。

3、项目中具体使用

3.1 controller层

/**

* 4、打印病程记录

* @author wanglong

* @date 2020年3月4日下午5:22:57

@RequestMapping(value = "printEmrCourse", method = RequestMethod.GET, produces = MediaType.APPLICATION_PDF_VALUE)

public void printEmrCourse(@RequestParam(value = "id", required = true) String id,

@RequestParam(value = "courseType", required = true) String courseType,

@RequestParam(value = "token", required = true) String token, HttpServletResponse response) {

List filePathList = new ArrayList();

Map> map = iEmrCourseSelectBusi.selectEmrCourseData(id, courseType, token);

try {

if (map.size() > 0) {

for (int i = 0, len = map.size(); i < len; i++) {

if (i % 2 == 0) {

String path1 = iEmrCourseSelectBusi.getCoursePdf(map.get("map" + i), "emrCourseLeft.jasper");

if (!"".equals(path1)) {

filePathList.add(path1);

}

} else {

String path2 = iEmrCourseSelectBusi.getCoursePdf(map.get("map" + i), "emrCourseRight.jasper");

if (!"".equals(path2)) {

filePathList.add(path2);

}

iEmrCourseSelectBusi.printEmrCoursePdf(filePathList, response);

}

} catch (Exception e) {

e.printStackTrace();

}

3.2 serviceImpl层

@Service("iEmrCourseSelectBusi")

public class EmrCourseBusiSelectImpl extends EmrCourseSelectServiceImpl implements IEmrCourseSelectBusi{

private static final long serialVersionUID = 1L;

private Font font = new Font("宋体", Font.PLAIN, 12);

// 读取配置文件里的jasper路径

@Value("${jasperPath}")

private String jasperPath;

/**

* 4、打印病程记录

* @author wanglong

* @date 2020年11月9日下午3:49:23

@Override

public Map> selectEmrCourseData(String id, String courseType, String token) {

Map> resultMap = new LinkedHashMap<>();

Map map = new LinkedHashMap<>();

int rows = 0, appointRow = 28;

StringBuffer bufferStr = new StringBuffer();

String lineBreak = System.getProperty("line.separator"); // 换行符

try {

EmrCourse record = emrCourseMapper.selectByPrimaryKey(id);

if (record != null) {

map.put("patientName", record.getPatientName());

map.put("fkHosRegisterHosNo", record.getFkHosRegisterHosNo());

String recordTime = DateUtil.dateToString(record.getCourseRecordTime(), "yyyy-MM-dd HH:mm");

String doctorName = record.getDoctorRealName();

if ("1".equals(courseType)) {

bufferStr.append(recordTime + lineBreak);

String tempStr = record.getGeneralRecords() == null ? "" : record.getGeneralRecords();

String blankStr = "";

if (!"".equals(tempStr)) {

blankStr = StringDealUtil.getSubString(blankStr, tempStr);

}

String generalRecords = record.getGeneralRecords() == null ? "" : (blankStr + lineBreak);

bufferStr.append(generalRecords);

}

String updateName = record.getUpdateOprName();

String opraterName = updateName == null ? record.getAddOprName() : updateName;

bufferStr.append("\t\t\t\t\t\t\t\t\t签名：" + opraterName + lineBreak);

String text = bufferStr.toString();

int length = text.length();

map = SubstrUtil.creatMyImage(text, font, appointRow, map, rows);

map.put("pageNum", "1");

resultMap.put("map0", map);

int index = (int) map.get("index");

if (length > index) {

String _text = StringDealUtil.getSurplusText(text, index);

resultMap = this.getOtherMap(_text, appointRow, resultMap, 1);

}

} catch (Exception e) {

e.printStackTrace();

}

return resultMap;

}

// 4.1 截取文本获取其余map

private Map> getOtherMap(String text, int appointRow,

Map> resultMap, int i) {

int length = text.length();

Map map = new LinkedHashMap<>();

map = SubstrUtil.creatMyImage(text, font, appointRow, map, 0);

map.put("pageNum", i + 1 + "");

resultMap.put("map"+ i, map);

int index = (int) map.get("index");

if (length > index) {

String _text = StringDealUtil.getSurplusText(text, index);

resultMap = this.getOtherMap(_text, appointRow, resultMap, i+1);

}

return resultMap;

}

/**

* 5、生成pdf

* @author wanglong

* @date 2020年11月9日下午1:52:42

@Override

public String getCoursePdf(Map map, String jasperName) {

String fileInfo = "";

Instant timestamp = Instant.now();

try {

JRDataSource jrDataSource = new JRBeanCollectionDataSource(null);

File reportFile = new File(jasperPath + jasperName);

String exportFileName = timestamp.toEpochMilli() + ".pdf";

fileInfo = jasperPath + exportFileName;

//调用工具类

JasperHelper.exportPdf2File(jasperPath + exportFileName, reportFile, map, jrDataSource);

} catch (Exception e) {

e.printStackTrace();

}

return fileInfo;

}

/**

* 5.1 合成pdf进行打印

* @author wanglong

* @date 2020年11月9日下午1:52:58

@Override

public void printEmrCoursePdf(List filePathList, HttpServletResponse response) {

List files = new ArrayList();

try {

if (filePathList != null && filePathList.size() > 0) {

for (int i = 0, length = filePathList.size(); i < length; i++) {

String pathName = filePathList.get(i);

files.add(new File(pathName));

}

String newFileName = Instant.now().toEpochMilli() + "病程记录mul2one.pdf";

String targetPath = jasperPath + newFileName;

File newFile = PdfMergeUtil.mulFile2One(files, targetPath);

if (newFile.exists()) {

// 先将单个的pdf文件删除

for (File file : files) {

if (file.exists() && file.isFile()) {

file.delete();

}

newFile.getName();

PdfUtil.downloadFile(response, targetPath, newFileName);

}

} catch (Exception e) {

e.printStackTrace();

}

4、工具类补充

package utils;

import net.sf.jasperreports.engine.*;

import net.sf.jasperreports.engine.util.JRLoader;

import java.io.*;

import java.util.Map;

public class JasperHelper {

/**

* 1、直接导出pdf文件

* @author wanglong

* @date 2020年10月31日下午9:10:41

public static void exportPdf2File(String defaultFilename, File is, Map parameters, JRDataSource conn) {

try {

JasperReport jasperReport = (JasperReport) JRLoader.loadObject(is);

JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, conn);

exportPdfToFile(jasperPrint, defaultFilename);

tnQOakRAO} catch (Exception e) {

e.printStackTrace();

}

// 1.1 导出Pdf

private static void exportPdfToFile(JasperPrint jasperPrint, String defaultFilename) throws IOException, JRException {

FileOutputStream ouputStream = new FileOutputStream(new File(defaultFilename));

JasperExportManager.exportReportToPdfStream(jasperPrint, ouputStream);

ouputStream.flush();

ouputStream.close();

}

package utils;

import java.io.File;

import java.io.IOException;

import java.util.List;

import org.apache.pdfbox.io.MemoryUsageSetting;

import org.apache.pdfbox.multipdf.PDFMergerUtility;

/**

* @name: PdfMergeUtil

* @Description: pdf合并拼接工具类

* @author wanglong

* @date 2020年2月25日下午4:33:13

* @version 1.0

public class PdfMergeUtil {

/**

* @Description: pdf合并拼接

* @param files 文件列表

* @param targetPath 合并到

* @throws IOException

public static File mulFile2One(List files,String targetPath) throws IOException{

// pdf合并工具类

PDFMergerUtility mergePdf = new PDFMergerUtility();

for (File f : files) {

if(f.exists() && f.isFile()){

// 循环添加要合并的pdf

mergePdf.addSource(f);

}

// 设置合并生成pdf文件名称

mergePdf.setDestinationFileName(targetPath);

// 合并pdf

mergePdf.mergeDocuments(MemoryUsageSetting.setupMainMemoryOnly());

return new File(targetPath);

}

package utils;

import javax.servlet.http.HttpServletResponse;

import java.io.*;

/**

* 导出PDF

public class PdfUtil {

// 下载

public static void downloadFile(HttpServletResponse response, String filePath, String fileName) {

if (fileName != null) {

response.reset();

response.setContentType("application/pdf");

// 设置文件路径

File file = new File(filePath);

if (file.exists()) {

byte[] buffer = new byte[1024];

FileInputStream fis = null;

BufferedInputStream bis = null;

try {

fis = new FileInputStream(file);

bis = new BufferedInputStream(fis);

OutputStream os = response.getOutputStream();

int i = bis.read(buffer);

while (i != -1) {

os.write(buffer, 0, i);

i = bis.read(buffer);

}

System.out.println("download success!");

} catch (Exception e) {

e.printStackTrace();

} finally {

if (bis != null) {

try {

bis.close();

} catch (IOException e) {

e.printStackTrace();

}

if (fis != null) {

try {

fis.close();

} catch (IOException e) {

e.printStackTrace();

}

file.delete();

}

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