AJAX动态加载chart（基于Bootstrap的chart.js）（原创）

一、创建一个bean，取名Info

Public class Info {
 private String name;
 private int count;

 public String getName() {
 return name;
 }

 public void setName(String name) {
 this.name = name;
 }

 public int getCount() {
 return count;
 }

 public void setCount(int count) {
 this.count = count;
 }

 public Info(String name,int count) {
 this.name = name;
 this.count = count;
 }

 public Info() {
 }
}

二、创建一个dao，取名InfoDao

public class InfoDao extends BaseDao{
 /**  * 获取材料信息统计  * @return  */  public ArrayList<Info> getInfoForMaterial(){
 ArrayList<Info> infos = new ArrayList<Info>();
 Connection con = null;
 PreparedStatement psmt = null;
 ResultSet rs = null;

 try{
 con = super.getConnection();
 psmt =con.prepareStatement("SELECT cm.materialName,COUNT(1) FROM cupmaterials AS cm INNER JOIN cups AS cu ON cm.materialId = cu.cupmaterialid GROUP BY cu.cupmaterialid");
 rs = psmt.executeQuery();
 while(rs.next()){
 String name = rs.getString(1);
 int count = rs.getInt(2);
 Info info = new Info(name,count);
 infos.add(info);
 }
 }catch (Exception ex){
 System.out.print("加载材质统计信息失败，原因是："+ex.getMessage());
 }finally {
 super.closeAll(rs,psmt,con);
 }
 return infos;
 }

三、在jsp页面：<canvasid="myChart-material" width="200" height="200"></canvas>

四、Servlet：

request.setCharacterEncoding("utf-8");

ArrayList<Info> infos=newInfoDao().getInfoForCharacter();

String result=newJSONArray(infos).toString();

response.setContentType("text/plain;charset=utf-8");

response.setCharacterEncoding("utf-8");

PrintWriter out = response.getWriter();

out.print(result);

五、js部分：

//产生随机色************************************************************************* function randomColor(){
 //颜色字符串  var colorStr="";
 //字符串的每一字符的范围  var randomArr=['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'];
 //产生一个六位的字符串  for(var i=0;i<6;i++){
 //15是范围上限，0是范围下限，两个函数保证产生出来的随机数是整数  colorStr+=randomArr[Math.ceil(Math.random()*(15-0)+0)];
 }
 return colorStr;
}

//页面加载时调用函数************************************************** $(function(){
 materialInfo()；
});

function materialInfo(){
 $.get(
 'getInfoForMaterial.do',function(result){
 var arr=[];
 for(var i = 0;i<result.length;i++){
 var json = {};
 json.value = result[i].count;
 json.color = "#"+randomColor();
 json.highlight ="#"+randomColor();
 json.label=result[i].name;
 arr.push(json);
 }
 var pieData = arr;

 var ctx = document.getElementById("myChart-material").getContext("2d");
 window.myPie = new Chart(ctx).Pie(pieData,{
 //responsive : true  });
 myPie.defaults = {
 segmentShowStroke : true,segmentStrokeColor : "#fff",segmentStrokeWidth : 2,animation : true,animationSteps : 100,animationEasing : "eaSEOutBounce",animateRotate : true,animateScale : false,onAnimationComplete : null  };
 },'json'  );
}

-------------------张成

（编辑：李大同）

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