根据指定对象内的字段,获取信息放入Map。或者将整个对象打印出来。
package com.chen.Test; import java.lang.reflect.Method; import java.util.Date; import java.util.HashMap; import java.util.Map; public class TestInvoke { private String c; private int num; private Date date; private boolean flag; public String getC() { return c; } public void setC(String c) { this.c = c; } public Date getDate() { return date; } public void setDate(Date date) { this.date = date; } public boolean isFlag() { return flag; } public void setFlag(boolean flag) { this.flag = flag; } public int getNum() { return num; } public void setNum(int num) { this.num = num; } /**根据column到obj对象中获取数值填充Map<br /> * * @author : EX-CHENWEIXIAN001 路人甲 * @create_date :2013-5-11 下午06:57:11 * @param obj * @param columns * @return */ public static Map fillMapByObject(Object obj, String[] columns) { String getMethodStartTag = "get"; // 获取数据的方法名前缀 String isMethodStartTag = "is"; // boolean获取数据的方法名前缀 if (obj instanceof Map) { return (Map)obj; } Map<String, Object> resultMap = new HashMap<String, Object>(); Method[] methods = obj.getClass().getMethods(); for (int i = 0; i < methods.length; i++) { String key = ""; boolean flag = false; String methodName = methods[i].getName(); if (methodName.subSequence(0, getMethodStartTag.length()).equals(getMethodStartTag) || methodName.subSequence(0, isMethodStartTag.length()).equals(isMethodStartTag)) { String tempName = ""; // 获取is后面的字段名称 if (methodName.indexOf(isMethodStartTag) == 0){ tempName = methodName.substring(isMethodStartTag.length(), methodName.length()); } // 获取get后面的字段名称 else { tempName = methodName.substring(getMethodStartTag.length(), methodName.length()); } for (int j = 0; j < columns.length; j++) { if (tempName.equalsIgnoreCase(columns[j])) { key = columns[j]; flag = true; break; } } } if (flag) { Object val = null; try { // 调用getter方法获取属性值 val = methods[i].invoke(obj); } catch (Exception e) { } resultMap.put(key, val); } } return resultMap; } /**对象转换为Map<br /> * * @author : EX-CHENWEIXIAN001 路人甲 * @create_date :2013-5-11 下午06:57:11 * @param obj * @param columns * @return */ public static Map fillMapByObject(Object obj) { String getMethodStartTag = "get"; // 获取数据的方法名前缀 String isMethodStartTag = "is"; // boolean获取数据的方法名前缀 if (obj instanceof Map) { return (Map)obj; } Map<String, Object> resultMap = new HashMap<String, Object>(); Method[] methods = obj.getClass().getMethods(); for (int i = 0; i < methods.length; i++) { String methodName = methods[i].getName(); // 获取所有get方法 if (methodName.subSequence(0, getMethodStartTag.length()).equals(getMethodStartTag) || methodName.subSequence(0, isMethodStartTag.length()).equals(isMethodStartTag)) { String tempName = ""; // 获取is后面的字段名称 if (methodName.indexOf(isMethodStartTag) == 0){ tempName = methodName.substring(isMethodStartTag.length(), methodName.length()); } // 获取get后面的字段名称 else { tempName = methodName.substring(getMethodStartTag.length(), methodName.length()); } // 将第一个字符转换为小写 String firstName = tempName.substring(0, 1).toLowerCase(); String lastName = ""; if (tempName.length() > 1) { lastName = tempName.substring(1, tempName.length()); } tempName = firstName + lastName; Object val = null; try { // 调用getter方法获取属性值 val = methods[i].invoke(obj); } catch (Exception e) { } resultMap.put(tempName, val); } } return resultMap; } /** * @author : EX-CHENWEIXIAN001 陈惟鲜 * @create_date :2013-5-11 下午06:25:17 * @param args */ public static void main(String[] args) { String[] columns = { "c", "flag", "TAB" }; TestInvoke t = new TestInvoke(); t.setC("cc"); t.setDate(new Date()); t.setNum(28); Map mapTemp = new HashMap(); mapTemp.put("id", "aa"); mapTemp.put("ggg", "bb"); System.out.println(fillMapByObject(t, columns)); System.out.println(fillMapByObject(mapTemp, columns)); System.out.println(fillMapByObject(t)); } }