用amchart的时候遇到一个难题：将数据库里的数据生成xml

（mysql5.0）sql脚本

CREATE TABLE `hostdiskinfo` (
`hdid` bigint(20) NOT NULL auto_increment,
`begintime` datetime default '0000-00-00 00:00:00',
`hdiskinfo` longtext,
`hostid` bigint(20) default '0',
PRIMARY KEY (`hdid`)
) ；

这是查询结果：
mysql> select hdiskinfo,begintime from hostdiskinfo where hostid=11
+-------------------------+---------------------+
| hdiskinfo               | begintime           |
+-------------------------+---------------------+
| C:,66.4;D:,82.8;E:,80.9 | 2009-02-06 15:15:03 |
| C:,66.4;D:,82.8;E:,80.9 | 2009-02-06 15:23:45 |
| C:,66.1;D:,82.8;E:,80.9 | 2009-02-06 15:30:02 |
| C:,64.4;D:,82.8;E:,83.8 | 2009-02-09 09:37:20 |
| C:,64.4;D:,82.8;E:,83.8 | 2009-02-09 09:39:41 |
| C:,64.4;D:,82.8;E:,83.8 | 2009-02-09 09:48:23 |
| C:,64.4;D:,82.8;E:,83.8 | 2009-02-09 09:51:14 |
+-------------------------+---------------------+
7 rows in set (0.00 sec)
现在的要求是要将以上的查询结果以下面形式写入到xml文件里面：
<?xml version="1.0" encoding="UTF-8"?>
<chart>
<series>
    <value xid="0">02-06 15:15</value>
    <value xid="1">02-06 15:23</value>
    <value xid="2">02-06 15:30</value>
    <value xid="3">02-09 09:37</value>
    <value xid="4">02-09 09:39</value>
    <value xid="5">02-09 09:48</value>
    <value xid="6">02-09 09:51</value>
</series>
<graphs>
    <graph gid="1" title="C:">
      <value xid="0">66.4</value>
      <value xid="1">66.4</value>
      <value xid="2">66.1</value>
      <value xid="3">64.4</value>
      <value xid="4">64.4</value>
      <value xid="5">64.4</value>
      <value xid="6">64.4</value>
    </graph>
    <graph gid="2" title="D:">
      <value xid="0">82.8</value>
      <value xid="1">82.8</value>
      <value xid="2">82.8</value>
      <value xid="3">82.8</value>
      <value xid="4">82.8</value>
      <value xid="5">82.8</value>
      <value xid="6">82.8</value>
    </graph>
    <graph gid="3" title="E:">
      <value xid="0">80.9</value>
      <value xid="1">80.9</value>
      <value xid="2">80.9</value>
      <value xid="3">83.8</value>
      <value xid="4">83.8</value>
      <value xid="5">83.8</value>
      <value xid="6">83.8</value>
    </graph>
</graphs>
</chart>

下面是我之前的实现方法：
package org.enilu.util.amchart;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.enilu.util.db.DBConnection;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

public class AmchartDemo02 {

/**
* @param args
*/
public static void main(String[] args) {
   // TODO Auto-generated method stub
   List all = getData();
   System.out.println(all.size());
   createXML(all);
}

public static List getData() {
   Connection conn = DBConnection.getConnection("conf.properties");
   List all = new ArrayList();
   ResultSet rs = null;
   Hostdiskinfo hd = null;
   PreparedStatement pstmt = null;
   String sql = "select hdiskinfo,begintime from hostdiskinfo where hostid=11";
   try {
    pstmt = conn.prepareStatement(sql);
    rs = pstmt.executeQuery();
    while (rs.next()) {
     hd = new Hostdiskinfo();
     hd.setHdiskinfo(rs.getString(1));
     hd.setBegintime(rs.getTimestamp(2));
     System.out.println(hd.getBegintime());
     all.add(hd);
    }
   } catch (SQLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   } finally {
    try {
     rs.close();
     pstmt.close();
     conn.close();
    } catch (SQLException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }

   }
   return all;
}

public static boolean createXML(List all) {
   Document doc = new Document();
   Element chart, series, value, graphs, ce, de, ee, fe, ge, he = null;
   ce = new Element("graph");
   de = new Element("graph");
   ee = new Element("graph");
   fe = new Element("graph");
   ge = new Element("graph");
   he = new Element("graph");
   chart = new Element("chart");
   series = new Element("series");
   graphs = new Element("graphs");

   for (int i = 0; i < all.size(); i++) {
    value = new Element("value");
    value.setAttribute("xid", i + "");
    Hostdiskinfo hd = (Hostdiskinfo) all.get(i);
    value.setText(hd.getBegintime().toString().substring(5, 16));

    series.addContent(value);
   }
   chart.addContent(series);
   Hostdiskinfo hd2 = (Hostdiskinfo) all.get(0);
   String st = hd2.getHdiskinfo();
   if (st.contains("C:")) {

    ce.setAttribute("gid", "1");
    ce.setAttribute("title", "C:");
   }
   if (st.contains("D:")) {

    de.setAttribute("gid", "2");
    de.setAttribute("title", "D:");
   }
   if (st.contains("E:")) {

    ee.setAttribute("gid", "3");
    ee.setAttribute("title", "E:");
   }
   if (st.contains("F:")) {

    fe.setAttribute("gid", "4");
    fe.setAttribute("title", "F:");
   }

   if (st.contains("G:")) {

    ge.setAttribute("gid", "5");
    ge.setAttribute("title", "G:");
   }

   if (st.contains("H:")) {

    he.setAttribute("gid", "6");
    he.setAttribute("title", "H:");
   }
   for (int a = 0; a < all.size(); a++) {
    Hostdiskinfo hd3 = (Hostdiskinfo) all.get(a);
    String[] st1 = hd3.getHdiskinfo().split(";");
    for (int b = 0; b < st1.length; b++) {
     String[] st2 = st1[b].split(",");
     value = new Element("value");
     value.setAttribute("xid", a + "");

     value.setText(st2[1]);

     if (st2[0] == "C:" || st2[0].equals("C:")) {

      ce.addContent(value);
     }
     if (st2[0] == "D:" || st2[0].equals("D:")) {
      de.addContent(value);
     }
     if (st2[0] == "E:" || st2[0].equals("E:")) {
      ee.addContent(value);
     }
     if (st2[0] == "F:" || st2[0].equals("F:")) {
      fe.addContent(value);
     }
     if (st2[0] == "G:" || st2[0].equals("G:")) {
      ge.addContent(value);
     }
     if (st2[0] == "H:" || st2[0].equals("H:")) {
      he.addContent(value);
     }

    }
   }
   if (ce.getChildren().size() > 1) {
    graphs.addContent(ce);
   }
   if (de.getChildren().size() > 1) {
    graphs.addContent(de);
   }
   graphs.addContent(ee);
   if (fe.getChildren().size() > 1) {

    graphs.addContent(fe);
   }
   if (ge.getChildren().size() > 1) {
    graphs.addContent(ge);
   }
   if (he.getChildren().size() > 1) {
    graphs.addContent(he);
   }
   chart.addContent(graphs);
   doc.addContent(chart);
   Format f = Format.getRawFormat();
   f.setEncoding("UTF-8");
   f.setIndent(" ");// 每一层元素缩排两格
   XMLOutputter XMLOut = new XMLOutputter(f);
   try {
    XMLOut.output(doc, new FileOutputStream("d:/amline_data.xml"));
    return true;
   } catch (FileNotFoundException e) {

    e.printStackTrace();
   } catch (IOException e) {

    e.printStackTrace();
   }
   return false;
}
}


我想不到其他的实现方法，本来打算在for循环里动态new graph实例，但是我做不到，不知哪位高人路过你呢个指点下^_^
效果图如下：




后来朋友给了个更好的循环方法，贴这儿^_^：

package org.enilu.util.amchart;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.enilu.util.db.DBConnection;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

public class AmchartDemo03 {


public static void main(String[] args) {

   List all = getData();

   createXML(all);
}

/**
* 从数据库里取得数据
*
* @return
*/
public static List getData() {
   Connection conn = DBConnection.getConnection("conf.properties");
   List all = new ArrayList();
   ResultSet rs = null;
   Hostdiskinfo hd = null;
   PreparedStatement pstmt = null;
   String sql = "select hdiskinfo,begintime from hostdiskinfo where hostid=11";
   try {
    pstmt = conn.prepareStatement(sql);
    rs = pstmt.executeQuery();
    while (rs.next()) {
     hd = new Hostdiskinfo();
     hd.setHdiskinfo(rs.getString(1));
     hd.setBegintime(rs.getTimestamp(2));
     System.out.println(hd.getBegintime());
     all.add(hd);
    }
   } catch (SQLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   } finally {
    try {
     rs.close();
     pstmt.close();
     conn.close();
    } catch (SQLException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }

   }
   return all;
}

/**
* 创建数据源文件xml
*
* @param all
* @return
*/
public static boolean createXML(List all) {
   Document doc = new Document();
   Element chart, series, value, graphs, graph = null;

   chart = new Element("chart");
   series = new Element("series");
   graphs = new Element("graphs");

   for (int i = 0; i < all.size(); i++) {
    value = new Element("value");
    value.setAttribute("xid", i + "");
    Hostdiskinfo hd = (Hostdiskinfo) all.get(i);
    value.setText(hd.getBegintime().toString().substring(5, 16));

    series.addContent(value);
   }

   Hostdiskinfo hostdiskinfo = (Hostdiskinfo) all.get(0);
   String diskinfo = hostdiskinfo.getHdiskinfo();

   chart.addContent(series);

   /* 随即取出一条数据根据是否大写判断有几个磁盘，并将磁盘名称放到集合allDriver里 */
   List allDriver = new ArrayList();
   Hostdiskinfo hd2 = (Hostdiskinfo) all.get(0);
   String st = hd2.getHdiskinfo();
   for (int i = 0; i < st.length(); i++) {
    Character c = st.charAt(i);
    if (c.isUpperCase(c)) {
     allDriver.add(c);
     System.out.println(c);
    }
   }
   int driverNum = allDriver.size();

   for (int m = 0; m < driverNum; m++) {
    graph = new Element("graph");
    graph.setAttribute("gid", m + "");
    graph.setAttribute("title", allDriver.get(m) + "盘");

    for (int n = 0; n < all.size(); n++) {
     Hostdiskinfo hd = (Hostdiskinfo) all.get(n);
     String st1[] = hd.getHdiskinfo().split(";");
     String st2[] = st1[m].split(",");
     value = new Element("value");
     value.setAttribute("xid", n + "");
     value.setText(st2[1]);
     graph.addContent(value).detach();
    }
    graphs.addContent(graph);
   }

   chart.addContent(graphs);
   doc.addContent(chart);
   Format f = Format.getRawFormat();
   f.setEncoding("UTF-8");
   f.setIndent(" ");// 每一层元素缩排两格
   XMLOutputter XMLOut = new XMLOutputter(f);
   try {
    XMLOut.output(doc, new FileOutputStream("d:/amline_data.xml"));
    return true;
   } catch (FileNotFoundException e) {

    e.printStackTrace();
   } catch (IOException e) {

    e.printStackTrace();
   }
   return false;
}
}


查看在新博客http://enilu.github.io的文章地址:http://enilu.github.io/%E9%9A%8F%E6%89%8B%E8%AE%B0/2009/09/28/%E7%94%A8amchart%E7%9A%84%E6%97%B6%E5%80%99%E9%81%87%E5%88%B0%E4%B8%80%E4%B8%AA%E9%9A%BE%E9%A2%98/