layui实现基础的增删改查

layui实现基础的增删改查

非必要不会把框架的每层代码放出来(没什么意义)

准备工作

配置layui参考(转)
https://blog.csdn.net/weixin_43977327/article/details/103016179

数据库先搞好
注意表名

我新建一个很简单的表

查询

后台新建一波文件
先导入可以生成layui可识别json的工具包

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.List;


/***
 * 
 * @author Administrator
 *
 */
public class ObjtoLayJson {
	
	public static  String toJson(Object object,String[] colums) throws Exception {
		 String[] dataRow = new String[colums.length];

		Field[] fields = object.getClass().getDeclaredFields();
		for (int i = 0; i < fields.length; i++) {
			String fieldName = fields[i].getName();
			String fistfont = fieldName.substring(0,1).toUpperCase();
			String methodname = "get"+fistfont+fieldName.substring(1);
			Method method = object.getClass().getMethod(methodname);
			if (method.invoke(object) == null) {
				dataRow[i] =  "null";
			}else {
				dataRow[i] =  method.invoke(object).toString();
			}
		}
		//System.out.println(Arrays.toString(dataRow));

		String jsonStr = "[{\"status\":0}, {\"message\": \"success\" }, {\"count\": 1000},{\"rows\":{\"item\":[";
		for(int i = 0; i < dataRow.length; i++) {
			String arr = "{";
			if (dataRow[i] == null || "NULL".equals(dataRow[i]) ) {
				arr += "\"\"";
			}else {
				arr += "\"" + colums[i] + "\""+":" ;
				arr +=  "\"" + dataRow[i]+"\"";
			}
			
			arr += "}";
			if( i < dataRow.length - 1 ) {
				arr += ",";
			}
			
			jsonStr += arr;
			
		}
		
		jsonStr += "]}}]";
		return jsonStr;
	}
	
	
	public static  <T> String ListtoJson(List<T> objects,String[] colums) throws Exception {
		String[][] dataRow = new String[objects.size()][colums.length];
		int count = 0;
		for (Object object : objects) {
			Field[] fields = object.getClass().getDeclaredFields();
			for (int i = 0; i < fields.length; i++) {
				String fieldName = fields[i].getName();
				String fistfont = fieldName.substring(0,1).toUpperCase();
				String methodname = "get"+fistfont+fieldName.substring(1);
				Method method = object.getClass().getMethod(methodname);
				if (method.invoke(object) == null) {
					dataRow[count][i] =  "null";
				}else {
					dataRow[count][i] =  method.invoke(object).toString();
				}
			}
			count += 1;
		}
		String jsonStr = "[{\"status\":0}, {\"message\": \"success\" }, {\"count\": 1000},{\"rows\":{\"item\":[";
		for(int i = 0; i < dataRow.length; i++) {
			String arr = "{";
			for( int j = 0; j < dataRow[i].length; j++) {
				//System.out.println("j======"+j);
				if(dataRow[i][j] == null || "NULL".equals(dataRow[i][j])) {
					arr += "\"\"";
				}else {
					arr += "\"" + colums[j] + "\""+":" ;
					arr +=  "\"" +dataRow[i][j] + "\"";
				}
				if( j < dataRow[i].length - 1 ) {
					arr += ",";
				}
			}
			arr += "}";
			if( i < dataRow.length - 1) {
				arr += ",";
			}
			
			jsonStr += arr;
		}
		jsonStr += "]}}]";
		return jsonStr;
	}
	public static void main(String[] args) throws Exception {
//		User user = new User();
//		user.setAge(18);
//		user.setId(1);
//		user.setPassword("123456789");
//		String[] colums = {"id","userName","Password","age"};
		String  jsonString = toJson(user,colums);
		System.out.println(jsonString);
//		List