读取html页面 显示图片,Servlet从本机读取一个图片，并显示在html页面

1、工具类

//工具类

package com.JavaBean;

import java.awt.image.BufferedImage;

import java.io.FileInputStream;

import java.io.IOException;

import javax.imageio.ImageIO;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServletResponse;

public class ImgUtil {

public static final String JPG = "jpg";

public static final String PNG = "png";

public static final String BMP = "bmp";

public static final String GIF = "gif";

/**

* 在servlet中调用该方法, jsp页面中img标签的src指向该servlet, 则会显示图片

*

* @param response

* @param path

* @param isResponseClose

*/

public static void showImage(HttpServletResponse response, String path, boolean isResponseClose) {

try {

ServletOutputStream outStream = response.getOutputStream();// 得到向客户端输出二进制数据的对象

FileInputStream fis = new FileInputStream(path); // 以byte流的方式打开文件

// 读数据

byte data[] = new byte[1000];

while (fis.read(data) > 0) {

outStream.write(data);

}

fis.close();

response.setContentType("image/*"); // 设置返回的文件类型

outStream.write(data); // 输出数据

if (isResponseClose) {

outStream.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

/**

* 在servlet中调用该方法, jsp页面中img标签的src指向该servlet, 则会显示图片

*

* @param response

* @param data

* @param isResponseClose

*/

public static void showImage(HttpServletResponse response, byte[] data, boolean isResponseClose) {

try {

ServletOutputStream outStream = response.getOutputStream();// 得到向客户端输出二进制数据的对象

// 读数据

outStream.write(data);

response.setContentType("image/*"); // 设置返回的文件类型

outStream.write(data); // 输出数据

if (isResponseClose) {

outStream.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

/**

* 在servlet中调用该方法, jsp页面中img标签的src指向该servlet, 则会显示图片

*

* @param response

* @param image

* @param imgType

* @param isResponseClose

*/

public static void showImage(HttpServletResponse response, BufferedImage image, String imgType, boolean isResponseClose) {

try {

ImageIO.write(image, imgType, response.getOutputStream());

} catch (IOException e) {

e.printStackTrace();

}

}

}

2、Servlet

package com.JavBean;

import java.io.IOException;

import com.JavaBean.ImgUtil; //导入前面的工具类

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ImgServlet extends HttpServlet {

private static final long serialVersionUID = 3728441236122484282L;

public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {

doPost(request, response);

}

public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {

String imgPath = request.getParameter("imgPath");// 输出图片的类型的标志

if(null != imgPath && !"".equals(imgPath.trim())) {

ImgUtil.showImage(response, imgPath, true);

}

}

}

3、html页面

显示图片

function request(paras){

var url = location.href;

var paraString = url.substring(url.indexOf("?")+1,url.length).split("&");

var paraObj = {}

for (i=0; j=paraString[i]; i++){

paraObj[j.substring(0,j.indexOf("=")).toLowerCase()] = j.substring(j.indexOf("=")+1,j.length);

}

var returnValue = paraObj[paras.toLowerCase()];

if(typeof(returnValue)=="undefined"){

return "";

}else{

return returnValue;

}

}

window.οnlοad=function() {

var len=document.documentElement.clientWidth-40;

var hit=document.documentElement.clientHeight-10;

var addr=request('addr');

document.writeln("");

}