JavaWeb-HttpServletResponse(一)

一.使用outputstream流向客户端浏览器输出"中国"

 1 package gacl.response.study;
 2 
 3 import java.io.ioexception;
 4 import java.io.outputstream;
 5 import javax.servlet.servletexception;
 6 import javax.servlet.http.httpservlet;
 7 import javax.servlet.http.httpservletrequest;
 8 import javax.servlet.http.httpservletresponse;
 9 
10 public class responsedemo01 extends httpservlet {
11 
12     public void doget(httpservletrequest request, httpservletresponse response)
13             throws servletexception, ioexception {
14         outputchinesebyoutputstream(response);//使用outputstream流输出中文
15     }
16     
17     /**
18      * 使用outputstream流输出中文
19      */
20     public void outputchinesebyoutputstream(httpservletresponse response) throws ioexception{
21         /**使用outputstream输出中文注意问题：
22          * 在服务器端，数据是以哪个码表输出的，那么就要控制客户端浏览器以相应的码表打开，
23          * 比如：outputstream.write("中国".getbytes("utf-8"));//使用outputstream流向客户端浏览器输出中文，以utf-8的编码进行输出
24          * 此时就要控制客户端浏览器以utf-8的编码打开，否则显示的时候就会出现中文乱码，那么在服务器端如何控制客户端浏览器以以utf-8的编码显示数据呢？
25          * 可以通过设置响应头控制浏览器的行为，例如：
26          * response.setheader("content-type", "text/html;charset=utf-8");//通过设置响应头控制浏览器以utf-8的编码显示数据
27          */
28         string data = "中国";
29         outputstream outputstream = response.getoutputstream();//获取outputstream输出流
30         response.setheader("content-type", "text/html;charset=utf-8");//通过设置响应头控制浏览器以utf-8的编码显示数据，如果不加这句话，那么浏览器显示的将是乱码
31         /**
32          * data.getbytes()是一个将字符转换成字节数组的过程，这个过程中一定会去查码表，
33          * 如果是中文的操作系统环境，默认就是查找查gb2312的码表，
34          * 将字符转换成字节数组的过程就是将中文字符转换成gb2312的码表上对应的数字
35          * 比如： "中"在gb2312的码表上对应的数字是98
36          *         "国"在gb2312的码表上对应的数字是99
37          */
38         /**
39          * getbytes()方法如果不带参数，那么就会根据操作系统的语言环境来选择转换码表，如果是中文操作系统，那么就使用gb2312的码表
40          */
41         byte[] databytearr = data.getbytes("utf-8");//将字符转换成字节数组，指定以utf-8编码进行转换
42         outputstream.write(databytearr);//使用outputstream流向客户端输出字节数组
43     }
44 
45     public void dopost(httpservletrequest request, httpservletresponse response)
46             throws servletexception, ioexception {
47         doget(request, response);
48     }
49 
50 }

二.使用printwriter流向客户端浏览器输出中文数据

 1 package gacl.response.study;
 2 
 3 import java.io.ioexception;
 4 import java.io.printwriter;
 5 
 6 import javax.servlet.servletexception;
 7 import javax.servlet.http.httpservlet;
 8 import javax.servlet.http.httpservletrequest;
 9 import javax.servlet.http.httpservletresponse;
10 
11 /**
12  * 使用printwriter流向客户端浏览器输出中文数据
13  * 还是输出“中国”这两个zi
14  */
15 public class responsedemo02 extends httpservlet {
16 
17     protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
18         //使用printwriter流输出中文
19         outputchinesebyprintwriter(response);
20         
21     }
22     /*
23      * 使用printwriter流输出中文
24      */
25     private void outputchinesebyprintwriter(httpservletresponse response) throws ioexception {
26         string data = "中国";
27         //设置将字符以“utf-8”编码输出到客户端浏览器
28         response.setcharacterencoding("utf-8");
29         //获取printwriter输出流
30         printwriter out = response.getwriter();
31         response.setheader("content-type", "text/html;charset=utf-8");
32 
33         //使用printwriter流向客户端输出字符
34          out.write(data);
35     }
36 
37     protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
38         doget(request, response);
39     }
40 
41 }

三.使用outputstream或者printwriter向客户端浏览器输出数字

 1 package gacl.response.study;
 2 
 3 import java.io.ioexception;
 4 import java.io.outputstream;
 5 import java.io.printwriter;
 6 
 7 import javax.servlet.servletexception;
 8 import javax.servlet.servletoutputstream;
 9 import javax.servlet.http.httpservlet;
10 import javax.servlet.http.httpservletrequest;
11 import javax.servlet.http.httpservletresponse;
12 
13 /**
14  * 使用outputstream或者printwriter向客户端浏览器输出数字
15  */
16 public class responsedemo03 extends httpservlet {
17 
18     protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
19         //使用outputstream输出1到客户端浏览器
20         //outputonebyoutputstream(response);
21         //使用printwriter流输出数字1
22         outputonebyprintwriter(response);
23     }
24     //使用printwriter流输出数字1
25     public void outputonebyprintwriter(httpservletresponse response) throws ioexception{
26         response.setheader("content-type", "text/html;charset=utf-8");
27         response.setcharacterencoding("utf-8");
28         printwriter out = response.getwriter();//获取printwriter输出流
29         out.write("使用printwriter流输出数字1：");
30         out.write(1+"");
31     }
32     //使用outputstream输出1到客户端浏览器
33     private void outputonebyoutputstream(httpservletresponse response) throws ioexception {
34         response.setheader("content-type", "text/html;charset=utf-8");
35         outputstream outputstream = response.getoutputstream();
36         outputstream.write("使用outputstream流输出数字1:".getbytes("utf-8"));
37         //outputstream.write(1);
38         outputstream.write((1+"").getbytes());
39     }
40 
41     protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
42         doget(request, response);
43     }
44 
45 }