小编Wil*_*voy的帖子

我在mongodb中有这些数据:

{  
    "name": "Amey",
    "country": "India",
    "region": "Dhule,Maharashtra"
}

我希望在将字段名称作为查询中的变量传递时检索数据.

以下不起作用:

var name = req.params.name;
var value = req.params.value;
collection.findOne({name: value}, function(err, item) {
    res.send(item);
});

如何查询mongodb保持字段名称及其值动态？

http://docs.aws.amazon.com/general/latest/gr/api-retries.html

本文档提到"每个AWS SDK实现自动重试逻辑,AWS SDK for Java自动重试请求".

如果我没有指定任何重试配置,那么Java AWS SDK的默认机制是什么？如果AWS服务端出现故障,我一直在使用Java AWS SDK并获得简单的服务异常.我从未经历过任何"自动"重试机制.有人可以解释一下这种重试机制是什么吗？

我有一个使用render_template的烧瓶web应用程序,如下所示.我需要在响应中添加Content-Security-Policy作为附加的http响应头.我尝试了下面的方法,但都失败了,给了我500.

1.

from flask import \
Flask, \
render_template
app = Flask(__name__,template_folder='tmpl')
@app.route('/')
def index():
    resp =make_response(render_template('index.html'))
    resp.headers['Content-Security-Policy']='default-src \'self\'' 
    return resp

if __name__ == '__main__':
app.run(host='0.0.0.0', port=3001)

2.

@app.route('/')
def index():
    resp =render_template('index.html')
    resp.headers.add('Content-Security-Policy','default-src \'self\'') 
    return resp

if __name__ == '__main__':
app.run(host='0.0.0.0', port=3001)   

这可能有什么不对？

在终端上,当我以webhost:3001访问Web应用程序时,我会看到以下内容

127.0.0.1 - - [06/Apr/2015 01:45:01]"GET/HTTP/1.1"500 -

我正在尝试在 Fedora 机器上构建一个 java 项目 http://sourceforge.net/projects/fuse-j/?source=typ_redirect。编译 JNI 绑定时编译失败。

生成文件

include ../build.conf
include ../jvm_ldpath.def

SRCS := javafs.c javafs_bindings.c
HDRS := javafs.h javafs_bindings.h
LIB_SO := libjavafs.so

INCLUDES := -I${FUSE_HOME}/include -I${JDK_HOME}/include    -I${JDK_HOME}/include/linux

LDPATH := ${LDPATH} -L${FUSE_HOME}/lib


all: ${LIB_SO}

${LIB_SO}: ${SRCS} ${HDRS}
gcc -fPIC -shared -D_FILE_OFFSET_BITS=64 -o ${LIB_SO} ${INCLUDES} ${LDPATH}   -ljvm -lfuse -lpthread ${SRCS}

clean:
   rm -f ${LIB_SO}

错误：

/bin/ld: cannot find -ljvm
collect2: error: ld returned 1 exit status
Makefile:17: recipe for target 'libjavafs.so' failed
make[1]: *** [libjavafs.so] Error 

JDK_HOME ，FUSE_HOME 设置正确。你能建议这里有什么问题吗？

我正在定义要检查的条件，以便以后动态加载服务接口的两个实现之一。

@Component
public class IsPolicyEnabled implements Condition {

    @Autowired
    private MyProperties props;

    @Override
    public boolean matches(ConditionContext arg0, AnnotatedTypeMetadata arg1) {
        return props.isPolicyEnabled();
    }

}

和

@Component
public class MyProperties {...}

和

@Service
@Conditional(IsPolicyEnabled.class)
public class ServiceA implements Service {...}

但是，我遇到了运行时错误。

java.lang.IllegalStateException: Failed to load ApplicationContext
Caused by: java.lang.NullPointerException
at com.xyz.utils.IsPolicyEnabled.matches(IsPolicyEnabled.java:9)
at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:108)
at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:88)
at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:71)
at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.isConditionMatch(ClassPathScanningCandidateComponentProvider.java:515)

基本上，它无法初始化已经自动连接到条件实现中的props对象。那是不允许的吗？

由于条件评估依赖于该依赖关系提供的值，因此我该如何自动在条件实现内部连接另一个依赖关系？

public class ProjectIdInitializer {
    public static void setProjectId(String projectId) {
        //load spring context which i want  to escape in my test
    }
}

public class MyService {
    public Response create(){
        ...
        ProjectIdInitializer.setProjectId("Test");
    }
}

@RunWith(PowerMockRunner.class)
@PrepareForTest({ProjectIdInitializer.class})
public class MyServiceTest{
    @InjectMocks
    private MyService myServiceMock ;

    public void testCreate() {
        PowerMockito.mockStatic(ProjectIdInitializer.class);
        PowerMockito.doNothing().when(ProjectIdInitializer.class, "setProjectId", Mockito.any(String.class));
        // Does not work,still tries to load spring context
        Response response=myServiceMock .create();
    }

如果从myservice调用ProjectIdInitializer.setProjectId(),我如何确保没有任何反应？