java how to write the menu on the left tree

action in the transfer of the code below:

public String listValueStandard(){
  		System.out.println("listValueStandard");
  		List<ValueStandard> types=basicNormService.getAllValueStandard();
  		List<TreeJson> trees = new ArrayList<TreeJson>();
  		for(int i=0;i<types.size();i++){
  			TreeJson json = new TreeJson();
  			json.setId(types.get(i).getValueStandardId()+"");
  			System.out.println("pid"+types.get(i).getParentId());
  			if(types.get(i).getParentId()==null){
  				json.setPid(null);
  			}else{
  			json.setPid(types.get(i).getParentId()+"");
  			}
  			json.setText(types.get(i).getName());
  			trees.add(json);
  		}
  		List<TreeJson> jsons = ListToTree.formatTree(trees);
  		JSONArray jsonarray=JSONArray.fromObject(types);
  		listValueStandard=jsonarray.toString();
  		return "tovaluestandard";
  	}

write unable retrieval success , the following is called the tree

entity classes :

 
  
  public class ValueStandard implements java.io.Serializable {
  
  	// Fields
  
  	private Integer valueStandardId;
  	private Integer parentId;
  	private String name;
  	private String note;
  	private String sequence;
  
  	// Constructors
  
  	/** default constructor */
  	public ValueStandard() {
  	}
  
  	/** minimal constructor */
  	public ValueStandard(Integer parentId) {
  		this.parentId = parentId;
  	}
  
  	/** full constructor */
  	public ValueStandard(Integer parentId, String name, String note,
  			String sequence) {
  		this.parentId = parentId;
  		this.name = name;
  		this.note = note;
  		this.sequence = sequence;
  	}
  
  	// Property accessors
  
  	public Integer getValueStandardId() {
  		return this.valueStandardId;
  	}
  
  	public void setValueStandardId(Integer valueStandardId) {
  		this.valueStandardId = valueStandardId;
  	}
  
  	public Integer getParentId() {
  		return this.parentId;
  	}
  
  	public void setParentId(Integer parentId) {
  		this.parentId = parentId;
  	}
  
  	public String getName() {
  		return this.name;
  	}
  
  	public void setName(String name) {
  		this.name = name;
  	}
  
  	public String getNote() {
  		return this.note;
  	}
  
  	public void setNote(String note) {
  		this.note = note;
  	}
  
  	public String getSequence() {
  		return this.sequence;
  	}
  
  	public void setSequence(String sequence) {
  		this.sequence = sequence;
  	}
  
  }

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java tree menu on the left to do http://blog.sina.com.cn/s/blog_6c7f922d0100q9xo.html
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do it in the page , with the z-tree, well used
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tree menu can be done is ugly
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a look at how to achieve a recursive algorithm , imitate what you can . This simple recursive menu easier to achieve
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entity class encapsulates error
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feel easyUI foreground framework written in this more convenient
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http://blog.csdn .net/yeness/article/details/9496647
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after setting up the data sets in the foreground show , this is a graphic design in general , and their own words to the Internet to look for your favorite style , but also a lot of
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I 've written a tree , and now mainly to the transfer of this tree , as an attribute of another one table.  


Oh misunderstood you mean, you want to call is now showing a tree in another page? If so you can use ajax call to this method alone extracted directly return a json string or data can be of
------ Solution --------------- -----------------------------
http://www.ztree.me/v3/demo.php
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their top .
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Well using easyUI reception
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I 've written a tree , and now mainly to the transfer of this tree , as an attribute of another one table.
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I 've written a tree , and now mainly to the transfer of this tree , as an attribute of another one table. Write
how to modify the above action
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I 've written a tree , and now mainly to the transfer of this tree , as an attribute of another one table.          
  
  
Oh misunderstood you mean, you want to call is now showing a tree in another page? If so you can use ajax call to this method alone extracted directly return a json string or the data can be  
Well I use ajax, but backstage action retrieval tree method is not so, the above is the transfer of a tree way I write, but can not be adjusted to take, you help me look at the code , where there are problems.
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been resolved , thank you.