Tree presentation of superior-subordinate relationships-Use of jquery + ztree + JSON

This article presents background data in the form of a tree after processing fastjson.

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It adopts the open-source ztree technology. For details, refer:

Http://www.oschina.net/p/ztree
Because the ztree format supports JSON, we create a node class [treenode. Java]

/*** Treenode. java * copyright (c) 2012 * created: cuiran 15:37:40 */package COM. fastjson. test;/*** todo * @ author cuiran * @ version todo */public class treenode {private integer ID; private integer PID; private string name; private Boolean checked; private Boolean open;/*** @ return the ID */Public integer GETID () {return ID ;} /*** @ Param ID the ID to set */Public void setid (integer ID) {This. id = ID;}/*** @ return the PID */Public integer getpid () {return PID ;} /*** @ Param ID the PID to set */Public void setpid (integer ID) {pid = ID ;} /*** @ return the name */Public String getname () {return name;}/*** @ Param name the name to set */Public void setname (string name) {This. name = Name;}/*** @ return the checked */Public Boolean ischecked () {return checked ;} /*** @ Param checked the checked to set */Public void setchecked (Boolean checked) {This. checked = checked;}/*** @ return the open */Public Boolean isopen () {return open ;} /*** @ Param open the open to set */Public void setopen (Boolean open) {This. open = open;} public treenode (integer ID, integer PID, string name, Boolean checked, Boolean open) {super (); this. id = ID; this. PID = PID; this. name = Name; this. checked = checked; this. open = open;} public treenode () {super ();}}

Create a treeservlet [treeservlet. Java]

Package COM. fastjson. test; import Java. io. ioexception; import Java. io. printwriter; import Java. util. arraylist; import Java. util. list; import javax. servlet. servletexception; import javax. servlet. HTTP. httpservlet; import javax. servlet. HTTP. httpservletrequest; import javax. servlet. HTTP. httpservletresponse; import COM. alibaba. fastjson. JSON; public class treeservlet extends httpservlet {/*** constructor of the object. */Public treeservlet () {super () ;}/ *** destruction of the servlet. <br> */Public void destroy () {super. destroy (); // just puts "Destroy" string in log // put your code here}/*** the doget method of the servlet. <br> ** this method is called when a form has its tag Value Method equals to get. ** @ Param request the request send by the client to the server * @ Param response the response send by the server to the client * @ throws servletexception if an error occurred * @ throws ioexception if an error occurred */Public void doget (httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {This. dopost (request, response);}/*** the dopost method of the servlet. <br> ** this method is called when a form has its tag Value Method equals to post. ** @ Param request the request send by the client to the server * @ Param response the response send by the server to the client * @ throws servletexception if an error occurred * @ throws ioexception if an error occurred */Public void dopost (httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {response. setcontenttype ("text/html"); response. setcharacterencoding ("UTF-8"); printwriter out = response. getwriter (); treenode node1 = new treenode (, "Beijing", false, true); treenode node2 = new treenode (, "Chaoyang District", false, true ); treenode node3 = new treenode (3,1, "Haidian District", false, true); treenode node4 = new treenode (4,0, "Hubei Province", false, true ); treenode node5 = new treenode (5, 4, "Wuhan City", false, true); treenode node6 = new treenode (6, 4, "Xiangyang City", false, true ); list <treenode> List = new arraylist <treenode> (); list. add (node1); list. add (node2); list. add (node3); list. add (node4); list. add (node5); list. add (node6); string jsonstring = JSON. tojsonstring (list); system. out. println ("Call Background:" + jsonstring); out. println (jsonstring); out. flush (); out. close ();}/*** initialization of the servlet. <br> ** @ throws servletexception if an error occurs */Public void Init () throws servletexception {// put your code here }}

Webpage code [tree. jsp]

<% @ Page Language = "Java" Import = "Java. util. * "pageencoding =" UTF-8 "%> <% string Path = request. getcontextpath (); string basepath = request. getscheme () + ": //" + request. getservername () + ":" + request. getserverport () + path + "/"; %> <! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en"> <HTML> 




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