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幾種java亂碼情況解決方法：
1、在Servlet中獲得通過get方式傳遞到服務(wù)器的數(shù)據(jù)時(shí)出現(xiàn)亂碼；
public class RegistServlet extends HttpServlet{ @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String name = req.getParameter("userName"); byte[] bytes = name.getBytes("ISO8859-1"); String newName = new String(bytes,"UTF-8"); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req, resp); } }
解析：在doGet方法中定義一個(gè)name變量獲得封裝在服務(wù)器的客戶端數(shù)據(jù)userName，然后將name以“ISO8859-1”的方式賦值給字節(jié)數(shù)組bytes，最后將此bytes數(shù)組以UTF-8的方式賦值給一個(gè)新創(chuàng)建的String變量newName，此時(shí)newName就是能正常顯示的數(shù)據(jù)，之所以這么麻煩，是因?yàn)闆]有直接的辦法一行代碼解決，可以就當(dāng)此方法為固定用法。
2、在Servlet中獲得通過post方式傳遞到服務(wù)器的數(shù)據(jù)時(shí)出現(xiàn)亂碼；
public class RegistServlet extends HttpServlet{ @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //注意：post方式提交數(shù)據(jù)的亂碼解決方式,放在getParameXXX方法之前 req.setCharacterEncoding("UTF-8"); //得到前臺(tái)input框中name="username"和password="password"的value值 String username = req.getParameter("username"); String password = req.getParameter("password"); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req, resp); } }
解析：post傳遞方式下解決亂碼問題很簡(jiǎn)單，就req.setCharacterEncoding(“UTF-8”); 這一行代碼，但需注意，要將這句話放在獲取數(shù)據(jù)之前。
3、Servlet通過服務(wù)器將數(shù)據(jù)響應(yīng)到客戶端時(shí)出現(xiàn)亂碼；
public class RegistServlet extends HttpServlet{ @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //方式一： resp.setContentType("text/html;charset=utf-8"); //方式二： resp.setHeader("Content-type", "text/html"); resp.setCharacterEncoding("UTF-8"); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req, resp); } }
解析：注意，以上兩種方法在應(yīng)用時(shí)要寫在輸出方法之前，另外，兩種方式效果一樣，因?yàn)榉绞揭惠^簡(jiǎn)潔，常用方式一。
4、HTML或JSP頁面在客戶端展示時(shí)出現(xiàn)的亂碼情況。
<head> <meta charset="UTF-8"> <meta http-equiv="Content-Type" content="text/html;charset=utf-8"> <title>form表單</title> </head>
