SpringMVC的檔案下載及中文編碼問題
阿新 • • 發佈：2019-02-13
首先配置web.xml檔案
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name 配置springmvc.xml檔案
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 開啟springm的註解 -->
<mvc:annotation-driven></mvc:annotation-driven>
<!-- 開啟掃描指定位置的包 -->
<context:component-scan base-package="lhc"></context:component-scan>
<!-- 開啟檢視解析器 -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
寫一個JSP頁面
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="java.net.URLEncoder" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<a href="${pageContext.request.contextPath }/download?filename=<%=URLEncoder.encode("風景.jpg","UTF-8")%>">圖片下載</a>
</body>
</html>
寫一個Controller,重點是處理中文編碼問題
package lhc.controller;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.io.FileUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class Download {
@RequestMapping("/todownload")
public String todownload() {
return "download";
}
@RequestMapping("/download")
public ResponseEntity<byte[]> fileDownload(String filename, HttpServletRequest request) {
String path = "D:/程式測試/要給客戶下載的檔案/";
String filename2 = null;
try {
//解決找到檔案問題:
// URLEonder把中文用UTF-8編碼,然而,tomcat用iso-8859-1解碼
//,我們需要用iso-8859-1編碼,再重新用utf-8解碼才能匹配到硬碟檔案的名字
filename2 = new String(filename.getBytes("ISO-8859-1"), "UTF-8");
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
File file = new File(path + filename2);
HttpHeaders headers = new HttpHeaders();
String filename3 = null;
try {
//解決提示下載框的中文問題:
// 所有瀏覽器都會使用本地編碼，即中文作業系統使用GBK
// 瀏覽器收到這個檔名後，會使用iso-8859-1來解碼
//編碼流程:把中文用GBK編碼為位元組陣列,再用ISO-8859-1編碼,瀏覽器先用ISO-8859-1解碼為位元組陣列,在用GBK解碼為中文
filename3 = new String(filename2.getBytes("GBK"), "ISO-8859-1");
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
headers.setContentDispositionFormData("attachment", filename3);
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
try {
return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.OK);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}