json 트 리 구조 (자바)
6573 단어 자바 기초 학습
package cn.info.platform.test;
import java.io.IOException;
import java.lang.String;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import org.omg.CORBA.PRIVATE_MEMBER;
import org.omg.CORBA.PUBLIC_MEMBER;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit38.AbstractJUnit38SpringContextTests;
import cn.info.platform.dao.FaqDao;
import cn.info.platform.entity.Faq;
import cn.info.platform.entity.FaqType;
/**
* @author Rocky
*/
@ContextConfiguration("classpath:spring-*.xml")
public class FaqTest extends AbstractJUnit38SpringContextTests {
@Autowired
private FaqDao faqDao;
public void testGetByID() {
ArrayList faqTypeList = faqDao.faqTypeList();
String nodeTree = getNodeTree(faqTypeList, 0);
System.out.println(nodeTree);
String nodeTreeSql = getNodeTreeSql(0);
System.out.println(nodeTreeSql);
}
private String getNodeTreeSql(int fid){
StringBuffer nodeStr = new StringBuffer("{");
nodeStr = nodeTreeSql(nodeStr, 0);
nodeStr = nodeStr.deleteCharAt(nodeStr.length() - 1);
return nodeStr.toString();
}
private StringBuffer nodeTreeSql(StringBuffer nodeTreeStr, int fid){
ArrayList faqTypeList = faqDao.faqTypeByFid(fid);
int len = faqTypeList.size();
if(len > 0){
nodeTreeStr.append("\"children\":[");
for(int i = 0; i < len; i++){
nodeTreeStr.append("{\"name\":\"" + faqTypeList.get(i).getName() + "\",");
nodeTreeStr = nodeTreeSql(nodeTreeStr, faqTypeList.get(i).getId());
}
nodeTreeStr.deleteCharAt(nodeTreeStr.length() - 1);
nodeTreeStr.append("]},");
}else{
nodeTreeStr.deleteCharAt(nodeTreeStr.length() - 1);
nodeTreeStr.append("},");
}
return nodeTreeStr;
}
private String getNodeTree(ArrayList faqTypeList, int fid){
StringBuffer nodeStr = new StringBuffer("{");
nodeStr = nodeTree(nodeStr, 0, faqTypeList);
nodeStr = nodeStr.deleteCharAt(nodeStr.length() - 1);
return nodeStr.toString();
}
private StringBuffer nodeTree(StringBuffer nodeTreeStr, int fid, ArrayList faqTypeList){
Boolean hasChildren = false;
StringBuffer nodeTr = new StringBuffer();
for(int i = 0; i < faqTypeList.size(); i++){
if(faqTypeList.get(i).getFid() == fid){
nodeTr.append("{\"name\":\"" + faqTypeList.get(i).getName() + "\",");
nodeTr = nodeTree(nodeTr, faqTypeList.get(i).getId(), faqTypeList);
hasChildren = true;
}
}
if(hasChildren == false){
nodeTreeStr.deleteCharAt(nodeTreeStr.length() - 1);
nodeTreeStr.append("},");
}else{
nodeTr.deleteCharAt(nodeTr.length() - 1);
nodeTreeStr.append("\"children\":[").append(nodeTr).append("]},");
}
return nodeTreeStr;
}
}
Json2Tree
package cn.info.platform.test;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import cn.info.platform.entity.FaqType;
/**
* Json
*
* @author luojiang2
*
*/
public class Json2Tree {
/**
* id,pid Json
*
* @param
* @param objs
* @param pidAttr
* @param idAttr
* @return
* @throws Exception
*/
public static String treeJson(long pid , List objs, StringBuilder builder, String pidAttr, String idAttr, String labelAttr) throws Exception {
if (objs.size() == 0){
return "{\"children\":[]}";
}
for(Iterator iter = objs.iterator(); iter.hasNext();) {
T t = iter.next();
long id = getLong(t, idAttr);
long temp_pid = getLong(t, pidAttr);
String label = getValue(t, labelAttr);
if(pid == Long.MAX_VALUE){
break;
}
if(temp_pid == pid){
builder.append("{\"id\":\"").append(id).append("\",");
builder.append("\"name\":\"").append(label).append("\",");
if(isHasChildren(id, objs, pidAttr)) {
builder.append("\"children\":[");
treeJson(id, objs, builder, pidAttr, idAttr, labelAttr);
builder.append("]},");
}else{
builder.deleteCharAt(builder.length() - 1).append("},");
}
}
}
builder.deleteCharAt(builder.length() - 1);
return builder.toString();
}
/**
* id
* @param
* @param id
* @param objs
* @return
* @throws Exception
*/
private static boolean isHasChildren(long id , List objs, String pidAttr) throws Exception{
for(T t : objs){
long pid = getLong(t, pidAttr);
if(pid == id){
return true;
}
}
return false;
}
private static long getLong(T t, String attrName) throws Exception {
Field field = t.getClass().getDeclaredField(attrName);
if (!field.isAccessible()) {
field.setAccessible(true);
}
Object value = field.get(t);
if (value == null){
return Long.MAX_VALUE;
}else{
return Long.parseLong(value.toString());
}
}
private static String getValue(T t, String attrName) throws Exception {
Field field = t.getClass().getDeclaredField(attrName);
if (!field.isAccessible()) {
field.setAccessible(true);
}
Object value = field.get(t);
if (value == null){
return "\"\"";
}else{
return value.toString();
}
}
public static void main(String[] args) throws Exception {
List lists = new ArrayList();
FaqType a1 = new FaqType();
FaqType a2 = new FaqType();
FaqType a3 = new FaqType();
FaqType a4 = new FaqType();
FaqType a5 = new FaqType();
FaqType a6 = new FaqType();
a1.setFid(-1);
a1.setId(1);
a1.setName("a");
a2.setFid(1);
a2.setId(2);
a2.setName("b");
a3.setFid(1);
a3.setId(3);
a3.setName("c");
a4.setFid(2);
a4.setId(4);
a4.setName("d");
a5.setFid(3);
a5.setId(5);
a5.setName("e");
a6.setFid(5);
a6.setId(6);
a6.setName("f");
lists.add(a1);
lists.add(a2);
lists.add(a3);
lists.add(a4);
lists.add(a5);
lists.add(a6);
String results = treeJson( -1,lists, new StringBuilder(), "fid", "id", "name");
System.out.println(results);
}
}
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