Controller报错：Could not find acceptable representation

controller的返回数据需要为json时，没有配置正确。
解决：
controller返回json格式给ajax请求的两种方法

1. JSON.toJsonString();

@RequestMapping(value = \"allBookName\", produces = \"text/html;charset=UTF-8\")
	public @ResponseBody String allBookName() {
		List<String> allBookName = bs.getBookName();
		List<QueryBoxData> allBookNameData = new ArrayList<QueryBoxData>();
		for (int i = 0; i < allBookName.size(); i++) {
			allBookNameData.add(new QueryBoxData(i, allBookName.get(i), false));
		}
		return JSON.toJSONString(allBookNameData);
	}

返回类型为String。
produces = “text/html;charset=UTF-8”
用的json工具是fastjson，pom. 文件导入依赖：

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>fastjson</artifactId>
	<version>1.2.53</version>
</dependency>

1. 返回对象或集合

@ResponseBody
	@SystemControllerLog(type=2,de ion=\"添加一个员工\")
	@RequestMapping(value = \"add\", produces = \"application/json;charset=utf-8\")
	public JsonData addEmp(@RequestParam(\"empName\") String empName,
						   @RequestParam(\"empDept\") String empDept,
						   @RequestParam(\"empHireDate\") String empHireDate,
						   @RequestParam(\"empStatus\") String empStatus,
						   @RequestParam(\"jobName\") String jobName,
						   @RequestParam(\"bankAccount\") String bankAccount) {
		JsonData data = new JsonData(\"addEmp\",
				es.addEmp(empName, empDept, empHireDate, empStatus, jobName, bankAccount), \"添加员工\", true);
		return data;
	}

produces=“application/json;charset=utf-8”
这里用的json工具是jackson。pom. 引入依赖：

<dependency>
	<groupId>com.faster .jackson.core</groupId>
	<artifactId>jackson-databind</artifactId>
	<version>2.9.1</version>
</dependency>