原生resultSet转bean

Posted 2020-10-13 站在西瓜上的猪

 1 package luowuhui.utils;
 2 
 3 import java.lang.reflect.Field;
 4 import java.lang.reflect.Method;
 5 import java.sql.ResultSet;
 6 import java.util.ArrayList;
 7 import java.util.List;
 8 
 9 public class CreateBean {
10 
11     /**
12      * @return
13      * @see 返回单个实体对象
14      */
15     public static <T> T getBean(Class<T> calss, ResultSet resultSet) {
16         // TODO Auto-generated method stub
17         // 创建对象
18         T object = null;
19         try {
20             object = createBean(calss, resultSet);
21 
22         } catch (Exception e) {
23             System.out.println("执行CreateBeanImp类getBean方法出现异常");
24             System.out.println("=================异常报告=================");
25             e.printStackTrace();
26             System.out.println("=================end=================");
27         }
28 
29         return object;
30     }
31 
32     /**
33      * @see 返回实体对象集
34      */
35     public static <T> List<T> getBeans(Class<T> calss, ResultSet resultSet) {
36         List<T> ts = null;
37         try {
38             ts = new ArrayList<>();
39             int i = 0;
40             while (resultSet.next()) {
41                 System.out.println(++i);
42                 ts.add(createBean(calss, resultSet));
43             }
44         } catch (Exception e) {
45             System.out.println("执行CreateBeanImp类getBean方法出现异常");
46             System.out.println("=================异常报告=================");
47             e.printStackTrace();
48             System.out.println("=================end=================");
49         }
50         return ts;
51     }
52 
53     /**
54      * @说明 创建实体
55      * @param calss
56      * @param resultSet
57      * @return 实体对象
58      * @throws Exception
59      *             <p>
60      *             创建对象时错误,69行<br>
61      *             获取resultSet值错误81行
62      *             </p>
63      */
64     private static <T> T createBean(Class<T> calss, ResultSet resultSet) throws Exception {
65         T object = calss.newInstance();
66         // 获取字段
67         Field[] fields = calss.getDeclaredFields();
68 
69         // 遍历fields
70         for (Field field : fields) {
71             // 获取字段名
72             String fieldName = field.getName();
73             if (!fieldName.equalsIgnoreCase("serialVersionUID")) {
74                 // 获取方法名
75                 String setMethodName = "set" + (char) (fieldName.charAt(0) - 32) + fieldName.substring(1);
76                 // 获取field类型
77                 Class type = field.getType();
78 
79                 Method method = calss.getDeclaredMethod(setMethodName, type);
80                 Object fieldVlaue = resultSet.getObject(fieldName);
81                 // System.out.println(setMethodName + ":" + fieldVlaue);
82                 method.invoke(object, fieldVlaue);
83             }
84 
85         }
86         // System.out.println();
87         // System.out.println(object);
88         return object;
89     }
90 }