spring boot配置跨域、全域性異常處理、page分頁配置、統一返回MessageResult

1、跨域配置

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

/**
 * @description: 跨域配置
 * @author: huangkailong
 * @create: 2020-10-30
 **/
@Configuration
public class CorsConfig {
    private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedOrigin("*"); //允許任何域名
        corsConfiguration.addAllowedHeader("*"); //允許任何頭
        corsConfiguration.addAllowedMethod("*"); //允許任何方法
        return corsConfiguration;
    }

    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig()); //註冊
        return new CorsFilter(source);
    }


}

2、全域性異常處理

import com.wc.robotapi.common.MessageResult;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

@RestControllerAdvice
public class APIExceptionHandler {
    /**
     * @description: 全域性異常處理配置
     * @author: huangkailong
     * @create: 2020-10-30
     **/
    @ExceptionHandler(value =Exception.class)
    public MessageResult exceptionHandler(Exception e){
        return  MessageResult.error(e.getMessage());
    }


}

3、使用page分頁配置

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MybatisPlusConfig {
    //分頁配置
    @Bean
    public PaginationInterceptor paginationInterceptor(){
        return new PaginationInterceptor();
    }
}

4、返回MessageResult物件

package com.wc.robotapi.common;

public class MessageResult<T> {

    private boolean Result;
    private String ErrorMessage;
    private T KeyValue;


    public static <T> MessageResult<T> success(T data){
        return new MessageResult<T>(data);
    }

    public static <T> MessageResult<T> success(){
        return new MessageResult<T>();
    }

    public static <T> MessageResult error(String _ErrorMessage){
        return new MessageResult<T>(_ErrorMessage);
    }

    private MessageResult(T data){
        this.Result = true;
        this.ErrorMessage = "SUCCESS";
        this.KeyValue = data;
    }
    private MessageResult(){
        this.Result = true;
        this.ErrorMessage = "SUCCESS";
    }

    private MessageResult(String _ErrorMessage){
//        if (_Result) {
//            return;
//        }
        this.Result = false;
        this.ErrorMessage = _ErrorMessage;
    }

    public boolean getResult() {
        return Result;
    }

    public void setResult(Boolean Result) {
        this.Result = Result;
    }

    public String getMessage() {
        return ErrorMessage;
    }

    public void setMessage(String ErrorMessage) {
        this.ErrorMessage = ErrorMessage;
    }

    public T getKeyValue() {
        return KeyValue;
    }

    public void setKeyValue(T KeyValue) {
        this.KeyValue = KeyValue;
    }
}