18.SPRINGBOOT 做前后端分离

Category

1. 增加个toString() 方便，便于显示
2. 增加个注解：@JsonIgnoreProperties({ "handler","hibernateLazyInitializer" }) ，否则会出错
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package com.how2java.springboot.pojo;
 
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
 
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 
@Entity
@Table(name = "category_")
@JsonIgnoreProperties({ "handler","hibernateLazyInitializer" }) 
public class Category {
 
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private int id;
     
    @Column(name = "name")
    private String name;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @Override
    public String toString() {
        return "Category [id=" + id + ", name=" + name + "]";
    }
     
}
 步骤 6 : 

CategoryController

控制器里提供3个方法，分别用来处理json 提交，json获取单个对象，json获取多个对象
 
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package com.how2java.springboot.web;
import java.util.List;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
 
import com.how2java.springboot.dao.CategoryDAO;
import com.how2java.springboot.pojo.Category;
  
@RestController
public class CategoryController {
    @Autowired CategoryDAO categoryDAO;
     
    @GetMapping("/category")
    public List<Category> listCategory(@RequestParam(value = "start", defaultValue = "0") intstart,@RequestParam(value = "size", defaultValue = "5") int size) throws Exception {
        start = start<0?0:start;
        Sort sort = new Sort(Sort.Direction.DESC, "id");
        Pageable pageable = new PageRequest(start, size, sort);
        Page<Category> page =categoryDAO.findAll(pageable);
        return page.getContent();
    }
     
    @GetMapping("/category/{id}")
    public Category getCategory(@PathVariable("id") int id) throws Exception {
        Category c= categoryDAO.getOne(id);
        System.out.println(c);
        return c;
    }
    @PutMapping("/category")
    public void addCategory(@RequestBody Category category) throws Exception {
        System.out.println("springboot接受到浏览器以JSON格式提交的数据："+category);
    }
}
 步骤 7 : 

submit.html

访问测试地址：
 
http://localhost:8080/submit.html
 

提交成功后，在springboot控制台查看使用json方式提交的数据
注： 不要在eclipse自带的浏览器里面点击，自带的浏览器有bug，有时候不能识别jquery, 会导致点击没有反应。 使用独立的浏览器，比如chrome,firefox点击测试
submit.html
 
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>用AJAX以JSON方式提交数据</title>
<script type="text/javascript" src="js/jquery.min.js"></script>
</head>
<body>
    <form >
       id：<input type="text" id="id" value="123" /><br/>
       名称：<input type="text" id="name" value="category xxx"/><br/>
        <input type="button" value="提交" id="sender"> 
    </form>
    <div id="messageDiv"></div>
         
    <script>
    $('#sender').click(function(){
        var id=document.getElementById('id').value;
        var name=document.getElementById('name').value;
        var category={"name":name,"id":id};
        var jsonData = JSON.stringify(category);
        var page="category";
          
        $.ajax({
               type:"put",
               url: page,
               data:jsonData,
               dataType:"json",
               contentType : "application/json;charset=UTF-8",
               success: function(result){
               }
            });
           alert("提交成功，请在springboot控制台查看服务端接收到的数据");
  
    });
    </script>
</body>
     
</html>
 步骤 8 : 

getOne.html

访问测试地址：
 
http://localhost:8080/getOne.html
 

注意：要确保id=10的分类对象存在
getOne.html
 
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>用AJAX以JSON方式获取数据</title>
<script type="text/javascript" src="js/jquery.min.js"></script>
</head>
<body>
    <input type="button" value="通过AJAX获取一个Hero对象---" id="sender"> 
     
    <div id="messageDiv"></div>
         
    <script>
    $('#sender').click(function(){
        var url="category/10";
        $.get(
                url,
                function(data) {
                    console.log(data);
                     var json=data;
                     var name =json.name;
                     var id = json.id;
                     $("#messageDiv").html("分类id："+ id + "<br>分类名称:" +name );
                        
         }); 
    });
    </script>
</body>
     
</body>
</html>
 步骤 9 : 

getMany.html

访问测试地址：
 
http://localhost:8080/getMany.html
 

点击按钮，获取多个json数据
getMany.html
 
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>用AJAX以JSON方式获取数据</title>
<script type="text/javascript" src="js/jquery.min.js"></script>
</head>
<body>
    <input type="button" value="通过AJAX获取多个分类对象" id="sender"> 
     
    <div id="messageDiv"></div>
         
    <script>
    $('#sender').click(function(){
        var url="category?start=0&size=100";
        $.get(
                url,
                function(data) {
                    var categorys = data;
                     for(i in categorys){
                         var old = $("#messageDiv").html();
                         var category = categorys[i];
                         $("#messageDiv").html(old + "<br>"+category.id+"   -----   "+category.name);
                     }
         }); 
    });
    </script>
</body>
     
</body>
</html>

posted on 2019-01-04 16:28  我是司  阅读(844)  评论(0)    收藏  举报

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