Spring Boot 5.统一处理异常

package com.example.springbootstudy;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import java.util.Map;

@ControllerAdvice  // 不指定包默认加了@Controller和@RestController都能控制
//@ControllerAdvice(basePackages ="com.example.springbootstudy")
public class ControllerAdviceHandler {

    private static final Logger logger = LoggerFactory.getLogger(ControllerAdviceHandler.class);

    @ResponseBody
    @ExceptionHandler(value = Exception.class)
    public String errorHandler(HttpServletRequest request, Exception exception) {
        writeErrorLogToFile(request, exception);
        return "系统异常";
    }

    // 将错误日志写到文件中
    private static void writeErrorLogToFile(HttpServletRequest request, Exception exception) {
        logger.error("                              ");
        logger.error("------------------------------");
        logger.error("系统异常 -- 请求地址：" + request.getRequestURI());
        printErrorQuestParameters(request.getParameterMap());
        logger.error("系统异常 -- 具体错误：" + exception.getMessage());
        logger.error("------------------------------");
    }

    // 打印系统异常时的请求参数
    private static void printErrorQuestParameters(Map<String, String[]> parameterMap) {
        for (Map.Entry<String, String[]> entry : parameterMap.entrySet()) {
            logger.error("系统异常 -- 请求参数：" + entry.getKey() + " -- 请求值：" + forEachStringList(entry.getValue()));
        }
    }

    private static String forEachStringList(String[] values) {
        StringBuilder stringBuilder = new StringBuilder();
        for (String item : values) {
            stringBuilder.append(item);
            stringBuilder.append(";");
        }
        return stringBuilder.toString();
    }

}

测试：

    @PostMapping("appError")
    public String appError(@RequestParam String name) throws Exception {
        logger.info("请求参数 -- name：" + name);
        logger.error("抛出异常");
        throw new Exception("自定义异常");
    }

结果：