jQuery treeview在JSP中的应用：ASYNC

来源：互联网发布：bim revit软件下载编辑：程序博客网时间：2024/05/20 17:07

1. async.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>Insert title here</title>

type="text/javascript"></script>

$(document).ready(function(){

$("#black").treeview({

url: "source.html",

control: "#treecontrol",

persist: "location"

});

</script>

</head>

<body>

href="http://bassistance.de/jquery-plugins/jquery-plugin-treeview/">jQuery

Treeview Plugin</a> Demo

</h1>

<h4>

Sample - async

</h4>

<a title="Collapse the entire tree below" href="#"><img

src="images/minus.gif" /> Collapse All</a>

<a title="Expand the entire tree below" href="#"><img

src="images/plus.gif" /> Expand All</a>

title="Toggle the tree below, opening closed branches, closing open branches"

href="#">Toggle All</a>

</div>

</ul>

</div>

</body>

</html>

2. SourceController

@Controller

public class SourceController {

@Autowired

SourceService sourceService;

@RequestMapping("/source.html")

public void source(HttpServletRequest request, HttpServletResponse response)

throws IOException {

request.setCharacterEncoding("utf-8");

response.setContentType("text/json;charset=UTF-8");

PrintWriter out = response.getWriter();

String root = request.getParameter("root");

String output = sourceService.generateNodeString(root);

out.print(output);

out.flush();

out.close();

}

3. SourceService

@Service("sourceService")

public class SourceService {

@Autowired

TestDao testDao;

public String generateNodeString(String root) {

if (root == null) {

return "";

} else if (root.equalsIgnoreCase("source")) {

return generateTopTreeString();

} else {

return generateSubTreeString(Long.parseLong(root));

}

private String generateTopTreeString() {

StringBuilder sb = new StringBuilder();

sb.append("[");

List<Item> list = testDao.findTopItem();

int i = 0;

for (Iterator<Item> it = list.iterator(); it.hasNext(); i++) {

if (i > 0) {

sb.append(",");

}

Item item = (Item) it.next();

sb.append(generateNodeString(item));

}

sb.append("]");

return sb.toString();

}

private String generateSubTreeString(Long itemId) {

StringBuilder sb = new StringBuilder();

sb.append("[");

List<Item> list = testDao.findSubItem(itemId);

int i = 0;

for (Iterator<Item> it = list.iterator(); it.hasNext(); i++) {

if (i > 0) {

sb.append(",");

}

Item item = (Item) it.next();

sb.append(generateNodeString(item));

}

sb.append("]");

return sb.toString();

}

private String generateNodeString(Item item) {

StringBuilder sb = new StringBuilder();

sb.append(" {");

sb.append(" /"text/": /"" + generateLinkString(item) + "/"");

if (testDao.hasSubItem(item.getItemId())) {

sb.append(", /"id/":/"" + item.getItemId() + "/"");

sb.append(", /"hasChildren/":true");

}

sb.append(" }");

return sb.toString();

}

private String generateLinkString(Item item) {

return "<a href='menu.html?menuId=" + item.getItemId()

+ "' target='main' >" + item.getItem() + "</a>";

}

4. Item

public class Item implements java.io.Serializable {

……

private Long itemId;

private String item;

private Long itemLevel;

private Set<Item> itemsForParentId = new HashSet<Item>(0);

private Set<Item> itemsForItemId = new HashSet<Item>(0);

……

}