方法1：通过get()方法获取属性值
package com.sxd.test.controller;public class FirstCa{ private Integer num; private String name; private Boolean flag; public Integer getNum() { return num; } public void setNum(Integer num) { this.num = num; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Boolean getFlag() { return flag; } public void setFlag(Boolean flag) { this.flag = flag; } } package com.sxd.test.controller;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.util.Comparator;import java.util.HashMap;import java.util.Map;import java.util.TreeMap;public class Test { @org.junit.Test public void testName() throws Exception { FirstCa ca = new FirstCa(); ca.setFlag(true); ca.setNum(30); Map map = getSortMap(ca); map.forEach((k,v)->{ System.out.println(k+">>>"+v); }); } /** * 使用java反射机制，动态获取对象的属性和参数值，排除值为null的情况，并按字典序排序 * @param object * @return * @throws Exception */ private Map getSortMap(Object object) throws Exception{ Field[] fields = object.getClass().getDeclaredFields(); Map map = new HashMap (); //迭代属性 for(Field field : fields){ String name = field.getName(); String methodName = "get" + name.replaceFirst(name.substring(0, 1), name.substring(0, 1) .toUpperCase()); // 调用getter方法获取属性值// Method getter = object.getClass().getMethod(methodName);// String value = getter.invoke(object)+""; //通过get方法直接获取属性值 field.setAccessible(true); Object value = field.get(object); if (value != null){ map.put(name, value.toString()); } System.out.println("字段名："+name); System.out.println("字段值："+field.get(object)); System.out.println("字段java语言修饰符："+field.getModifiers()); System.out.println("字段类型："+field.getType()); System.out.println(""); } Map sortMap = new TreeMap ( new Comparator () { @Override public int compare(String arg0, String arg1) { return arg0.compareTo(arg1); } }); sortMap.putAll(map); return sortMap; } }
Field.setAccessible(true);得作用就是让我们在用反射时访问私有变量
运行结果：
方法2： 通过属性自己的getter方法获取属性值
package com.sxd.test.controller;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.util.Comparator;import java.util.HashMap;import java.util.Map;import java.util.TreeMap;public class Test { @org.junit.Test public void testName() throws Exception { FirstCa ca = new FirstCa(); ca.setFlag(true); ca.setNum(30); Map map = getSortMap(ca); map.forEach((k,v)->{ System.out.println(k+">>>"+v); }); } /** * 使用java反射机制，动态获取对象的属性和参数值，排除值为null的情况，并按字典序排序 * @param object * @return * @throws Exception */ private Map getSortMap(Object object) throws Exception{ Field[] fields = object.getClass().getDeclaredFields(); Map map = new HashMap (); //迭代属性 for(Field field : fields){ String name = field.getName(); String methodName = "get" + name.replaceFirst(name.substring(0, 1), name.substring(0, 1) .toUpperCase()); // 调用getter方法获取属性值 Method getter = object.getClass().getMethod(methodName); String value = getter.invoke(object)+""; //通过get方法直接获取属性值// field.setAccessible(true);// Object value = field.get(object); if (value != null && !"null".equals(value)){ map.put(name, value); } System.out.println("字段名："+name); System.out.println("字段值："+value); System.out.println("字段java语言修饰符："+field.getModifiers()); System.out.println("字段类型："+field.getType()); System.out.println(""); } Map sortMap = new TreeMap ( new Comparator () { @Override public int compare(String arg0, String arg1) { return arg0.compareTo(arg1); } }); sortMap.putAll(map); return sortMap; } }
运行结果：
