SpringMVC重定向和转发

1、常规用法，返回一个View

@RequestMapping(value="/testa", method=RequestMethod.GET)
public String inputData(){
    return "testa"; //Spring框架找到对应的View并渲染
}

@RequestMapping(value="/testa", method=RequestMethod.POST)
public String outputData(HttpServletRequest request){
    String userName = request.getParameter("name");
    String password = request.getParameter("pwd");
    request.setAttribute("name", userName);
    request.setAttribute("pwd", password);
    return "testb"; //Spring框架找到对应的View并渲染
 }

2、转发"forward:/..."

@RequestMapping(value="/testa", method=RequestMethod.GET)
public String inputData(){
    return "testa"; //Spring框架找到对应的View并渲染
}

@RequestMapping(value="/testa", method=RequestMethod.POST)
public String outputData(HttpServletRequest request){
    return "forward:/testb"; //转发到 /testb 的Controller方法(即outputDataX)上
}

@RequestMapping(value="/testb", method=RequestMethod.POST)
public String outputDataX(HttpServletRequest request){
    return "testb";
}

3、重定向"redirect:/..."

@RequestMapping(value="/testa", method=RequestMethod.GET)
public String inputData(){
    return "testa"; //Spring框架找到对应的View并渲染
}

@RequestMapping(value="/testa", method=RequestMethod.POST)
public String outputData(HttpServletRequest request){
    //重定向到 /testb 的Controller方法(即outputDataY)上
    return "redirect:/testb"; 
}

@RequestMapping(value="/testb", method=RequestMethod.POST)
public String outputDataX(HttpServletRequest request){
    return "testb";
}

@RequestMapping(value="/testb", method=RequestMethod.GET)
public String outputDataY(HttpServletRequest request){
    return "testb";
}