java对象转为json数据在前台展示

public String selectVO() throws Exception {
ServletActionContext.getRequest().setCharacterEncoding("UTF-8");
// 设置返回的编码和不缓存数据
ServletActionContext.getResponse().setContentType("text/html;charset=UTF-8");
ServletActionContext.getResponse().setHeader("cache-control","no-cache");
PrintWriter out = ServletActionContext.getResponse().getWriter();

InvestmentPlatform vo = (InvestmentPlatform) investmentPlatformManager.findByPrimaryKey(id);
if (vo != null) {
String temp="{'legal_representative':'"+vo.getLegal_representative()+"','province':'"+vo.getProvince()+"',"
+ "'city':'"+vo.getCity()+"','phone':'"+vo.getPhone()+"','category':'"+vo.getCategory()+"','totalAsset':'"+vo.getTotalAsset()+"','loseAsset':'"+vo.getLoseAsset()+"'}";
out.print(temp);
}
out.flush();
out.close();
return null;
}

function addData(name,id){
$.post("${pageContext.request.contextPath }/investmentPlatform/investmentPlatform_selectVO.action",
{id:id}, function(data) {
if (data!=null) {
var obj = eval("("+data+")");
$("#legal_representative").val(obj.legal_representative);
$("#city").val(obj.province+"    "+obj.city);
$("#phone").val(obj.phone);
$("#category").val(obj.category);
$("#totalAsset").val(obj.totalAsset);
$("#loseAsset").val(obj.loseAsset);
}
});
}