怎样在servlet中读取文件中的图片

package read;

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

public class ShowImage extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
private PrintWriter out;

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

try {
response.setContentType( "image/jpeg;charset=GB2312 "); // 设置返回的文件类型
//String path1=request.getRealPath( "/10.gif ");
String path1= "C:/Program Files/Apache Software Foundation/Tomcat 5.0/webapps/read/10.gif ";
File file = new File(path1);
System.out.println(file);
FileInputStream hFile = new FileInputStream(file); // 以byte流的方式打开文件
int i = hFile.available(); // 得到文件大小
System.out.println(i);
System.out.print( "chenggong1 ");
byte data[] = new byte[i];
hFile.read(data); // 读数据
hFile.close();
System.out.print( "chenggong2 ");
OutputStream toClient = response.getOutputStream(); // 得到向客户端输出二进制数据的对象
toClient.write(data); // 输出数据
toClient.close();
System.out.print( "chenggong3 ");
} catch (IOException e){ // 错误处理
PrintWriter toClient = response.getWriter(); // 得到向客户端输出文本的对象
response.setContentType( "text/html;charset=gb2312 ");
toClient.write( "无法打开图片! ");
toClient.close();
}
out.print( "1231 ");
}

}