EnvironmentSystemIntegrationTests.java 文件源码

@Test
public void registerServletParamPropertySources_GenericWebApplicationContext() {
    MockServletContext servletContext = new MockServletContext();
    servletContext.addInitParameter("pCommon", "pCommonContextValue");
    servletContext.addInitParameter("pContext1", "pContext1Value");

    GenericWebApplicationContext ctx = new GenericWebApplicationContext();
    ctx.setServletContext(servletContext);
    ctx.refresh();

    ConfigurableEnvironment environment = ctx.getEnvironment();
    assertThat(environment, instanceOf(StandardServletEnvironment.class));
    MutablePropertySources propertySources = environment.getPropertySources();
    assertThat(propertySources.contains(StandardServletEnvironment.SERVLET_CONTEXT_PROPERTY_SOURCE_NAME), is(true));

    // ServletContext params are available
    assertThat(environment.getProperty("pCommon"), is("pCommonContextValue"));
    assertThat(environment.getProperty("pContext1"), is("pContext1Value"));

    // Servlet* PropertySources have precedence over System* PropertySources
    assertThat(propertySources.precedenceOf(PropertySource.named(StandardServletEnvironment.SERVLET_CONTEXT_PROPERTY_SOURCE_NAME)),
            lessThan(propertySources.precedenceOf(PropertySource.named(StandardEnvironment.SYSTEM_PROPERTIES_PROPERTY_SOURCE_NAME))));

    // Replace system properties with a mock property source for convenience
    MockPropertySource mockSystemProperties = new MockPropertySource(StandardEnvironment.SYSTEM_PROPERTIES_PROPERTY_SOURCE_NAME);
    mockSystemProperties.setProperty("pCommon", "pCommonSysPropsValue");
    mockSystemProperties.setProperty("pSysProps1", "pSysProps1Value");
    propertySources.replace(StandardEnvironment.SYSTEM_PROPERTIES_PROPERTY_SOURCE_NAME, mockSystemProperties);

    // assert that servletcontext init params resolve with higher precedence than sysprops
    assertThat(environment.getProperty("pCommon"), is("pCommonContextValue"));
    assertThat(environment.getProperty("pSysProps1"), is("pSysProps1Value"));
}