JQuery AJAX跨域交付参数、接收json数据 _JavaScript

JQuery AJAX跨域提交参数、接收json数据

需求是a服务器下页面b.jsp需要调用b服务器的action CoureseInfoProvideAction.java，用了JQuery+ajax技术，返回json类型的数据：

b.jsp:

<script type="text/javascript">
	 function showCourseInfo(){
		var resourceCode = document.getElementById("resourceCode").value;
		jQuery.getJSON("http://10.10.6.31:8099/coureseInfoProvide.jhtml?courseNumber="+resourceCode, function(data) {
          if(data!="0"){
  			   document.getElementById('resourceName').value = data.courseName;
			   document.getElementById('languageType').value = data.lang;
          }else{
          	   alert("课件编码不存在!!!");
	      }
   		});
	 }
</script>
<body>

<dt>
                <label><span>*</span> 课件名称：</label>
                    </dt>
                    <dd>
                        <input type="text" class="default_txt" id="resourceName" name="resourceName"/>
                    </dd>
                    <dt>
                        <label><span>*</span> 课件编码：</label>
                    </dt>
                    <dd>
                        <input type="text" class="default_txt" id="resourceCode" name="resourceCode" value="112290_eng"/>
                        <input name="Button2" type="button" class="btn btn_default" onclick="showCourseInfo()" value="Load…" />
                    </dd>
                    <dt>
                        <label>语言属性：</label>
                    </dt>
                    <dd>
                        <select id="languageType" name="languageType" class="mini_sel">
                            <option>-请选择-</option>
                            <option value="1">中文</option>
                            <option value="0">英文</option>
                            <option value="-1">其他</option>
                        </select>
                        <input type="text" class="default_txt" id="languageNote" name="languageNote"/>
                    </dd>
</body>

CoureseInfoProvideAction.java:

public String process() throws Exception {
		response.setContentType("text/xml;charset=UTF-8");
		response.setHeader("Cache-Control", "no-cache");
		response.addHeader("Access-Control-Allow-Origin", "*");
		response.addHeader("Access-Control-Allow-Headers", "x-requested-with");
		
		PrintWriter out = response.getWriter();
		if(StringUtil.isBlank(courseNumber)){
			Course course = courseService.getValidCourse(courseNumber);
			if(course!=null){
				StringBuilder sb = new StringBuilder();
				String courseName = course.getCourseName();
				sb.append("{");
				sb.append("\"");
				sb.append("courseName");
				sb.append("\"");
				sb.append(":");
				sb.append("\"");
				sb.append(courseName);
				sb.append("\"");
				Integer lang = course.getLang();
				sb.append(",");
				sb.append("\"");
				sb.append("lang");
				sb.append("\"");
				sb.append(":");
				sb.append("\"");
				sb.append(lang);
				sb.append("\"");
				sb.append("}");
				out.print(sb.toString());
				
				course = null;
			}else{
				out.print("0");
			}
		}
		return null;
	}

在CoureseInfoProvideAction.java中增加了response对header的处理，用于对跨域提交参数的支持，在StringBuilder中把字符串组装成了json的格式，在页面便于解析、接收参数。