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Springboot练习-学生教务系统笔记1

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本文字数： 11k 阅读时长 ≈ 18 分钟

前言:学习springboot后，做个小项目练习一下

新建SpringBoot项目

image-20200116220837861

image-20200116220918494

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/**
 * @author shency
 * @description: Hello World
 */
@Controller
public class HelloController {
    /**
     * @author shency
     * @description: Hello World
     */
    @RequestMapping("/hello")
    @ResponseBody
    public String hello(){
        return "hello world";
    }
}

运行访问http://localhost:8080/hello 访问成功（注意要加注解@ResponseBody或者@RestController,@ResponseBody 表示该方法的返回结果直接写入HTTP response body中）

image-20200116221755456

application.properties

springboot配置文件 位于resources文件夹下

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server.port=8080
server.servlet.context-path=/orange
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html

maven中添加下列依赖用于使用thymeleaf

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<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

在resources/templates中新建index.html,在resources/static中新建index2.html

HelloController新增以下代码

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@RequestMapping("/html")
public String html() {
    return "index";
}
@RequestMapping("/html2")
public String html2() {
    return "index.html";
}

启动后target目录如下

image-20200116220951333

访问Controller http://localhost:8080/orange/html

image-20200116221005090

访问Controller http://localhost:8080/orange/html2

image-20200116221016237

访问static下资源 http://localhost:8080/orange/index2.html

image-20200116221024603

热部署

1、File | Settings | Build, Execution, Deployment | Compiler 中选择Build project automatically

image-20200116221038895

2、Ctrl+Shift+a 搜索 registry 或者 Ctrl+Shift+Alt+/

compiler.automake.allow.when.app.running -> 自动编译
compile.document.save.trigger.delay -> 自动更新文件

主要是针对静态文件如JS,CSS的更新，将延迟时间减少后，直接按F5刷新页面就能看到效果！

image-20200116221049944

3、Run/Debug Configurations

image-20200116221847287

4、maven 添加下列依赖
spring-boot-devtools 是自动重启，但如果项目大，重启时间慢，建议还是别用，直接Ctrl+Shift+F9

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<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <optional>true</optional>
</dependency>

5、 浏览器缓存
F12 network中勾选Disable cache

image-20200116221201240

或者F12 进入setting（F1），勾选Disable cache
image-20200116221128687

html获取ModelAndView中的数据

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@RequestMapping("/getData")
public ModelAndView getData(){
    ModelAndView model = new ModelAndView();
    model.addObject("method","GetData");
    model.setViewName("index.html");
    return model;
}

在index.htmk中使用Thymeleaf获取数据

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<li th:text="${method}"></li>

目录结构层次

image-20200116221240262

request包

新建BaseRequset.java

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/**
 * @author shency
 * @description: BaseRequset
 */
@Data
public abstract class BaseRequset implements Serializable {

    private static final long serialVersionUID = 985010454743040538L;

    // 请求IP
    public String requestIp;

    // 请求时间
    public String requestTime;

}

request包

新建UserRequest.java

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package com.scy.orange.request;
import lombok.Getter;
import lombok.Setter;
/**
 * @author shency
 * @description: TODO
 */
@Getter
@Setter
public class UserRequest extends BaseRequset {
    private int id;
    private String username;
}

enums包

新建CommonResultCodeEnum.java

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package com.scy.orange.enums;

/**
 * @author shency
 * @description: 通用返回结果枚举
 */
public enum CommonResultCodeEnum {
    SUCCESS("000000","成功"),
    SYSTEM_ERROR("999999","系统");

    private final String code;

    private final String desc;

    public String getCode(){
        return code;
    }

    public String getDesc(){
        return desc;
    }

    CommonResultCodeEnum(String code,String desc){
        this.code = code;
        this.desc = desc;
    }

    public static CommonResultCodeEnum getResultCode(String code){
        for(CommonResultCodeEnum resultCode:values()){
            if(resultCode.getCode().equals(code)){
                return resultCode;
            }
        }
        return SYSTEM_ERROR;
    }

}

vo包

新建ResultModel.java

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package com.scy.orange.vo;


import com.scy.orange.enums.CommonResultCodeEnum;
import lombok.Data;

import java.io.Serializable;

/**
 * @author shency
 * @description: Controller层返回结果模型
 */
@Data
public class ResultModel<T> implements Serializable {

    private static final long serialVersionUID = -9090347033463853016L;

    /**
     * 返回数据总数量
     */
    private Integer count;

    /**
     * 接口返回对象
     */
    private T result;

    /**
     * 接口返回code
     */
    private String code;

    /**
     * 接口返回msg
     */
    private String msg;

    public ResultModel(){};

    public ResultModel(String code, String msg) {
        this.code= code;
        this.msg = msg;
    }
    public ResultModel(T result,String msg,String code){
        this.result = result;
        this.msg = msg;
    }

    public ResultModel<T> setSuccess(T result){
        this.result = result;
        this.msg = CommonResultCodeEnum.SUCCESS.getDesc();
        this.code= CommonResultCodeEnum.SUCCESS.getCode();
        return this;
    }
    public ResultModel<T> setSuccess(){
		return this.setSuccess(null);
	}
}

HelloController.java

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import com.scy.orange.request.UserRequest;
import com.scy.orange.vo.ResultModel;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.ArrayList;
import java.util.List;

/**
 * @author shency
 * @description: Hello World
 */
@Controller
public class HelloController {
    /**
     * @author shency
     * @description: Hello World
     */
    @RequestMapping("/hello")
    @ResponseBody
    public String hello(){
        return "hello world";
    }

    @RequestMapping("/getData")
    @ResponseBody
    public ResultModel<List<UserRequest>> userList(@RequestBody UserRequest userRequest){
        List<UserRequest> userRequestlist = new ArrayList<UserRequest>();
        String[] name = new String[]{ "Tom","Jack","Cameron","Ewen","William","Matthew","David"};
        for(int i = 0;i<name.length;i++){
            userRequest = new UserRequest();
            userRequest.setId(i);
            userRequest.setUsername(name[i]);
            userRequestlist.add(userRequest);
        }
        return new ResultModel<List<UserRequest>>().setSuccess(userRequestlist);
    }

    @RequestMapping("/index")
    public String index() {
        return "index";
    }
}

index.html

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>index</title>
    <script type="text/javascript" src="/orange/js/jquery-3.4.1.min.js"></script>
</head>
<body>
<script type="text/javascript">
    $.fn.serializeJSON=function(){
        var serializeObj={};
        var array=this.serializeArray();
        $(array).each(function(){
            if(serializeObj[this.name]){
                if($.isArray(serializeObj[this.name])){
                    serializeObj[this.name].push(this.value);
                }else{
                    serializeObj[this.name]=[serializeObj[this.name],this.value];
                }
            }else{
                serializeObj[this.name]=this.value;
            }
        });
        return serializeObj;
    }
    // $(function(){});等价于$(document).ready(function(){});
    $(function(){
        console.log("js ready");
        $("#submitForm").on('click', function(event){
            event.preventDefault();
            console.log("ajax requset");
            $.ajax({
                url : "/orange/getData",
                method : 'post',
                contentType : 'application/json',
                data : JSON.stringify($('#form1').serializeJSON()),
                success : function(data) {
                    console.log(data);
                },
                error : function(e) {
                    console.log("Error" + e);
                }
            });
        });
    });
    /*
    $(document).ready(function() {
        console.log("js ready");
        $("#submitForm").on('click', function(event){
            event.preventDefault();
            console.log("ajax requset");
            $.ajax({
                url : "/orange/getData",
                method : 'post',
                contentType : 'application/json',
                data : JSON.stringify($('#form1').serializeJSON()),
                success : function(data) {
                    console.log(data);
                },
                error : function(e) {
                    console.log("Error" + e);
                }
            });
        });
    });
    */
</script>
<form id="form1">
    <table>
        <tr>
            <th>ID:</th>
            <th><input type="text" id="id" name="id"value="1"></th>
        </tr>
        <tr>
            <td>用户名:</td>
            <td><input type="text" id="name" name="name" value="Jack"></td>
        </tr>
        <tr>
            <td><input type="button" value="提交" id="submitForm"></td>
        </tr>
    </table>
</form>
</body>
</html>

application.properties

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server.port=8080
server.servlet.context-path=/orange
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html
spring.thymeleaf.cache=false

运行截图

访问 http://localhost:8080/orange/index 并提交表单

image-20200116221642157

异常处理

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package com.scy.orange.exceptions;

import com.scy.orange.enums.CommonResultCodeEnum;
import org.springframework.util.StringUtils;

import java.io.Serializable;

/**
 * @author shency
 * @description: 业务层异常类
 */
public class BizException extends RuntimeException implements Serializable {
    private static final long serialVersionUID = -5728999797840771015L;
    private String            code;

    private String            msg;

    private String            detailMessage;

    public BizException() {
        super();
    }

    public BizException(CommonResultCodeEnum resultCode) {
        super();
        this.code = resultCode.getCode();
        this.msg = resultCode.getDesc();
    }

    public BizException(String code, String message) {
        super();
        this.code = code;
        this.msg = message;
    }

    public BizException(CommonResultCodeEnum  resultCode, String detailMessage) {
        super();
        this.code = resultCode.getCode();
        this.msg = resultCode.getDesc();
        this.detailMessage = detailMessage;
    }

    public String getCode() {
        return code;
    }

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

    public String getMsg() {
        return msg;
    }

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

    public void setDetailMessage(String detailMessage) {
        this.detailMessage = detailMessage;
    }

    @Override
    public String getMessage() {
        return StringUtils.isEmpty(detailMessage) ? msg : detailMessage;
    }

    @Override
    public String toString() {
        StringBuffer controlExceptionStr = new StringBuffer();
        controlExceptionStr.append("[BizException]");
        controlExceptionStr.append("code:");
        controlExceptionStr.append(code);
        controlExceptionStr.append(",msg:");
        controlExceptionStr.append(msg);
        controlExceptionStr.append(",detailMessage:");
        controlExceptionStr.append(detailMessage);

        return controlExceptionStr.toString();
    }
}

修改CommonResultCodeEnum类

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package com.scy.orange.enums;

import com.scy.orange.exceptions.BizException;
import org.springframework.util.Assert;

/**
 * @author shency
 * @description: 通用返回结构枚举
 */
public enum CommonResultCodeEnum {
    SUCCESS("000000","运行成功"),
    SYSTEM_ERROR("999999","系统错误");

    private final String code;

    private final String desc;

    public String getCode(){
        return code;
    }

    public String getDesc(){
        return desc;
    }

    CommonResultCodeEnum(String code,String desc){
        this.code = code;
        this.desc = desc;
    }

    public static CommonResultCodeEnum getResultCode(String code){
        for(CommonResultCodeEnum resultCode:values()){
            if(resultCode.getCode().equals(code)){
                return resultCode;
            }
        }
        return SYSTEM_ERROR;
    }

    public static void main(String[] args) {
        Object s=null;
        try {
            Assert.notNull(s, CommonResultCodeEnum.SYSTEM_ERROR.getDesc());
        } catch (RuntimeException e) {
            throw new BizException(CommonResultCodeEnum.SYSTEM_ERROR);
        }
    }
}

这就是对于异常的处理。main运行结果如下

image-20200116221337705

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