查閱資料,大都表示需要 加入依賴的jar，jackson-core-asl-1.9.12.jar，jackson-mapper-asl-1.9.12.jar問題解決。

經測試不是這個錯誤不是必須依賴這兩個 jar。

如下配置正常返回資料

pom.xml

        <!-- Jackson JSON Processor -->

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>${jackson.version}</version>
        </dependency>
 

springMvc.xml 中

    <mvc:annotation-driven>
        <mvc:message-converters register-defaults="false">
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>text/html;charset=utf-8</value>
                        <value>text/xml;charset=utf-8</value>
                        <value>text/plain;</value>
                        <value>text/json;charset=utf-8</value>
                        <value>application/json;charset=UTF-8</value>
                    </list>
                </property>
            </bean>
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
        </mvc:message-converters>
    </mvc:annotation-driven>
 

Controller中 

  @RequestMapping(value = "checkLogin", method = RequestMethod.POST)
    @ResponseBody
    public ResultDto checkLogin(String name, String password, int role) {

        return loginService.checkLogin(name, password, role);
    }

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ResultDTO物件缺少部分 get 方法導致 格式化 JSON 物件時出錯。

移除 上面2個 jar 與返回物件的 get 方法進行測試，報406錯誤碼。

debug 程式碼 於 ServletInvocableHandlerMethod.class 中捕獲異常 "Could not find acceptable representation"

新增 get 方法後測試正常返回該物件的 JSON 字元

public class ResultDto {

    private boolean succeed;
    private Object data;

    public ResultDto(boolean succeed) {
        this.succeed = succeed;
    }

    public ResultDto(boolean succeed, Object data) {
        this.succeed = succeed;
        this.data = data;
    }

/*
    public boolean isSucceed() {
        return succeed;
    }

    public Object getData() {
        return data;
    }
*/

    public void setSucceed(boolean succeed) {
        this.succeed = succeed;
    }

    public void setData(Object data) {
        this.data = data;
    }
}