java在使用@RequestMapping注释时获取请求的值（URL）

Question

当我将多个值映射到@RequestMapping（比如Multiple Spring @RequestMapping annotations）时，我能得到请求的值（URL）吗

像这样：

@RequestMapping(value={"/center", "/left"}, method=RequestMethod.GET)
public String getCenter(Model model) throws Exception {     
    String requestedValue = getRequestedValue();  // I want this.

    // I want to do something like this with requested value.
    String result; 
    if (requestedValue.equals("center")
        result = "center";
    else if (requestedValue.equals("left")
        result = "left";
    return result;
}

Answer 1

从Spring 3.1.0开始，可以使用URI Template Patterns with Regular Expressions

@RequestMapping(value={"/{path:[a-z-]+}"}, method=RequestMethod.GET)
public String getCenter(@PathVariable String path) throws Exception {             
    // "path" is what I want
}

Answer 2

使用RequestParam注释。还可以向方法中添加HttpServletRequest类型的参数，然后从中获取参数

Answer 3

从Spring 3.1.0开始，您可以使用ServletUriComponentsBuilder

@RequestMapping(value={"/center", "/left"}, method=RequestMethod.GET)
    public String getCenter(Model model) throws Exception {     
        UriComponentsBuilder builder = ServletUriComponentsBuilder.fromCurrentRequest();
        String requestedValue = builder.buildAndExpand().getPath();  // I want this.
        System.out.println(requestedValue);
        // I want to do something like this with requested value.
        String result="fail"; 
        if (requestedValue.equals("center"))
            result = "center";
        else if (requestedValue.equals("left"))
            result = "left";
        return result;
    }

Answer 4

下面的正则表达式将使您的方法仅对URL /center和/left执行。您可以通过@PathVariable注释获得值

@GetMapping("/{path:^center$|^left$}")
public ResponseEntity<?> whatIsThePath(@PathVariable String path){
    // path is either "center" or "left"
}