springboot json 异常统一处理，自定义异常处理

参考：http://www.fengyunxiao.cn

1. 建立 json 结果类，用于统一处理 json 结果

public class JsonResult<T> {
    // code=0表示成功，返回数据data。data!=0，表示错误，返回错误信息msg
    private int code;
    // 若有错误，data不生成json
    @JsonInclude(JsonInclude.Include.NON_NULL)
    private T data;
    // 若无错误，msg 不生成 json
    @JsonInclude(JsonInclude.Include.NON_NULL)
    private String msg;

    public JsonResult() {
        code = 0;
    }

    public JsonResult<T> ok(T data) {
        this.code = 0;
        this.data = data;
        return this;
    }

    public JsonResult<T> error(int code, String msg) {
        this.code = code;
        this.msg = msg;
        return this;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }
}

2. 建立自定义异常类

public class CustemerException extends Exception {
    public CustemerException(String message) {
        super(message);
    }
}

3. 建立 rest controller 的异常抓捕类

@RestControllerAdvice
public class JsonExceptionHandler {

    @ExceptionHandler(value = Exception.class)
    public JsonResult<String> resolveException(HttpServletRequest request, HttpServletResponse response, Exception e) {
        JsonResult<String> result = new JsonResult<>();
        return result.error(1, e.getMessage());
    }

}

4. 在 rest controller的方法中抛出异常

@Controller
public class TestController {

    @RequestMapping("/test_error")
    public Object testError() throws Exception {
        if (true) {
            throw new CustemerException("抛出自定义异常");
        }
        return 1;
    }

}

5. 测试

参考：http://www.fengyunxiao.cn