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Jsp&Servlet实现读取本地图片并展示

2014-02-17 15:41 316 查看
在Web开发中图片的读取和展示是一个很常见的功能，实现的过程大致也都一样（包括在各种框架中……）！接下来用流的方式来实现图片的展示

1、 创建Servlet，实现读取，请求方式使用get请求；

 

package com.senvn.servlet;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ShowImageServlet extends HttpServlet {

private static final String JPG="image/jpeg;charset=GB2312";

/**
* get方法
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 本地文件路径
String filePath = "D:"+File.separator+"temp"+File.separator+"test1.jpg";
File file = new File(filePath);
// 获取输出流
OutputStream outputStream = response.getOutputStream();
FileInputStream fileInputStream = new FileInputStream(file);
// 读数据
byte[] data = new byte[fileInputStream.available()];
fileInputStream.read(data);
fileInputStream.close();
// 回写
response.setContentType(JPG);
outputStream.write(data);
outputStream.flush();
outputStream.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

}
}


 

2、 配置文件，web.xml

 

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>Servlet</display-name>
<servlet>
<description>显示图片Servlet</description>
<display-name>显示图片</display-name>
<servlet-name>ShowImageServlet</servlet-name>
<servlet-class>com.senvn.servlet.ShowImageServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>ShowImageServlet</servlet-name>
<url-pattern>/showImage.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>


 

3、 页面展示

 

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'upload.jsp' starting page</title>
</head>

<body>
<img alt="showImage" src="/Servlet/showImage.do">
</body>
</html>


 

4、 直接访问jsp即可

 

路径截图:






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