Servlet响应的中文字符集问题

在Servlet中利用response向客户端浏览器输出中文时有时会遇到乱码问题，总结如下：

response输出流有两种，一是以字节流输出，一是以字符流输出。

一、以字节流输出：1.默认编码输出木有乱码2.通过response的setHeader方法设置编码utf-8，无乱码3.通过response的setContentType方法设置编码utf-8，无乱码4.输出数字建议以字符串形式输出

二、以字符流输出：1.默认查iso-8859-1码表(SUN的Servlet规范要求的) ，客户端显示乱码2.通过response的setHeader方法设置编码utf-8，无乱码3.通过response的setContentType方法设置编码utf-8，无乱码

字节流以默认编码输出：

 1 public void doGet(HttpServletRequest request, HttpServletResponse response) 2             throws ServletException, IOException { 3         // 以字节流用默认编码向客户端输出中文数据,木有乱码 4         response.setContentType("text/html"); 5  6         String str = "喔呵呵呵呵"; 7         OutputStream out = response.getOutputStream(); 8         out.write("</br></br><div align=/"center/" style=/"font-size:25px; color:red/">".getBytes()); 9 10         out.write(str.getBytes());11 12         out.write("</div>".getBytes());13         out.close();14 }

字节流设置编码为utf-8输出：

 1 public void doGet(HttpServletRequest request, HttpServletResponse response) 2             throws ServletException, IOException { 3  4         // 通知客户端查UTF-8码表 5         response.setContentType("text/html;charset=utf-8"); 6  7         // 或者： 8         // response.setHeader("Content-Type","text/html;charset=utf-8"); 9 10         String str = "喔哈哈哈哈";11         OutputStream out = response.getOutputStream();12         out.write("</br></br><div align=/"center/" style=/"font-size:25px; color:red/">".getBytes());13 14         out.write(str.getBytes("utf-8"));15 16         out.write("</div>".getBytes());17         out.close();18 }

字节流输出数字：

 1 public void doGet(HttpServletRequest request, HttpServletResponse response) 2             throws ServletException, IOException { 3         response.setHeader("Content-Type", "text/html;charset=utf-8"); 4  5         int i = 98; 6         OutputStream out = response.getOutputStream(); 7  8         out.write("</br></br><div align=/"center/" style=/"font-size:25px; color:red/">" 9                 .getBytes());10 11         // out.write(i); 会输出字母b12 13         // 输出数字9814         out.write((i + "").getBytes());15 16         out.write("</div>".getBytes());17         out.close();18 }

字符流设置编码为utf-8输出：

 1 public void doGet(HttpServletRequest request, HttpServletResponse response) 2             throws ServletException, IOException { 3         // 通知客户端查UTF-8码表 4         response.setContentType("text/html;charset=utf-8"); 5         // 或者： 6         // response.setHeader("Content-Type", "text/html;charset=utf-8"); 7  8         String str = "喔嘿嘿嘿嘿"; 9         PRintWriter out = response.getWriter();10         out.write("</br></br><div align=/"center/" style=/"font-size:25px; color:red/">");11 12         out.write(str);13 14         out.write("</div>");15         out.flush();16         out.close();17 }