在Servlet中利用response向客戶端瀏覽器輸出中文時有時會遇到亂碼問題，總結如下：

response輸出流有兩種，一是以字節流輸出，一是以字符流輸出。

一、以字節流輸出：1.默認編碼輸出木有亂碼2.通過response的setHeader方法設置編碼utf-8，無亂碼3.通過response的setContentType方法設置編碼utf-8，無亂碼4.輸出數字建議以字符串形式輸出

二、以字符流輸出：1.默認查iso-8859-1碼表(SUN的Servlet規范要求的) ，客戶端顯示亂碼2.通過response的setHeader方法設置編碼utf-8，無亂碼3.通過response的setContentType方法設置編碼utf-8，無亂碼

字節流以默認編碼輸出：

 1 public void doGet(HttpServletRequest request, HttpServletResponse response) 2             throws ServletException, IOException { 3         // 以字節流用默認編碼向客戶端輸出中文數據,木有亂碼 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 }

字節流設置編碼為utf-8輸出：

 1 public void doGet(HttpServletRequest request, HttpServletResponse response) 2             throws ServletException, IOException { 3  4         // 通知客戶端查UTF-8碼表 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 }

字節流輸出數字：

 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); 會輸出字母b12 13         // 輸出數字9814         out.write((i + "").getBytes());15 16         out.write("</div>".getBytes());17         out.close();18 }

字符流設置編碼為utf-8輸出：

 1 public void doGet(HttpServletRequest request, HttpServletResponse response) 2             throws ServletException, IOException { 3         // 通知客戶端查UTF-8碼表 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 }