HttpServletRequest类的常用方法，获取参数，解决POST中文乱码

• getRequestURI() 获取请求的资源路径
• getRequestURL() 获取请求的统一资源定位符（资源路径）
• getRemoteHost() 获取客户端的IP地址
• getHeader() 获取请求头
• getParameter() 获取请求参数
• getParameterValues() 获取请求的参数(多个值时候使用)
• getMethod() 获取请求的方式GET或POST
• setAttribute(key,value); 设置域数据
• getAttribute(key); 获取域数据
• getRequestDispatcher() 请求转发函数

首先需要编辑HTML表单

    
    



    用户名: 

    密码: 

    兴趣爱好：JAVA
    兴趣爱好：JavaScript
    兴趣爱好：C+
    

其在Servlet类中写入方法体

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取请求的参数
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        String[] hobby = req.getParameterValues("hobby");(获取多个参数)

        System.out.println("username:"+username);
        System.out.println("密码"+password);
        System.out.println("兴趣爱好"+ Arrays.asList(hobby));
    }

在doPost方法头部中写入
 //设置请求体字符集为UTF-8
        req.setCharacterEncoding("UTF-8");

 protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //设置请求体字符集为UTF-8
        req.setCharacterEncoding("UTF-8");
        
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        String[] hobby = req.getParameterValues("hobby");

        System.out.println("username:"+username);
        System.out.println("密码"+password);
        System.out.println("兴趣爱好"+ Arrays.asList(hobby));

        System.out.println("POST");
    }