response練習1

1.使用response處理中文亂碼
 
package com.hbsi.response;
 
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public class Response1 extends HttpServlet {
 
public void doGet(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {
 
test5(response);
 
}
 
// 沒有亂碼，個體Bytes（）默認是GB2312，瀏覽器默認也是GB2312
 private void test1(HttpServletResponse response) throws IOException,
 UnsupportedEncodingException {
 String str = "河北";
 
OutputStream out = response.getOutputStream();
 out.write(str.getBytes());
 }
 
// 有亂碼，因此要進行處理
 private void test2(HttpServletResponse response) throws IOException,
 UnsupportedEncodingException {
 String str = "河北";
 // 發送消息頭，通知瀏覽器以UTF-8打開內容
 // response.setHeader("Content-Type","text/html;charset=UTF-8");
 response.setContentType("text/html;charset=UTF-8");
 OutputStream out = response.getOutputStream();
 out.write(str.getBytes("UTF-8"));
 }
 
// 不發送http頭，而是發送了一段html內容來控制瀏覽器以utf-8打開。
 private void test3(HttpServletResponse response) throws IOException,
 UnsupportedEncodingException {
 String str = "河北";
 // 發送消息頭，通知瀏覽器以UTF-8打開內容
 
OutputStream out = response.getOutputStream();
 out
 .write("<meta http-equiv='content-type' content='text/html; charset=UTF-8'>"
 .getBytes());
 out.write(str.getBytes("UTF-8"));
 }
 
// 採用字符輸出流，response默認的編碼是iso8859-1，
 private void test4(HttpServletResponse response) throws IOException,
 UnsupportedEncodingException {
 String str = "河北";
 // 把response的編碼改爲UTF-8；
 // response.setCharacterEncoding("UTF-8");
 
// 告訴瀏覽器，以UTF-8顯示
 // response.setHeader("Content-Type","text/html;charset=UTF-8");
 
response.setContentType("text/html;charset=UTF-8");
 PrintWriter out = response.getWriter();
 out.println(str);
 
}
 //課後思考！！
 private void test5(HttpServletResponse response) throws IOException,
 UnsupportedEncodingException {
 //response.getWriter().write(14);
 response.getOutputStream().write(14);
 
}
 
public void doPost(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {
 
doGet(request, response);
 }
 
}

 
2.使用response實現文件下載
 
package com.hbsi.response;
 
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URLEncoder;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public class Response2 extends HttpServlet {
 
public void doGet(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {
 
//1.獲取要下載的資源
 String path = this.getServletContext().getRealPath("/download/視頻1.avi");
 String filename = path.substring(path.lastIndexOf("\\")+1);
 //System.out.println(filename);
 
//2.通知瀏覽器以下載方式打開發送過來的數據
 //response.setHeader("content-disposition","attachment;filename="+filename);
 //如果文件名是中文，要經過URL編碼
 response.setHeader("content-disposition","attachment;filename="+URLEncoder.encode(filename,"UTF-8"));
 //如果文件名是中文，要經過URL編碼
 //3.讀取資源內容
 FileInputStream fis = new FileInputStream(path);
 byte[] buffer = new byte[1024];
 int len = 0;
 while((len=fis.read(buffer))>0){
 response.getOutputStream().write(buffer,0,len);
 }
 fis.close();
 
}
 
public void doPost(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {
 
doGet(request, response);
 }
 
}