Web Services Java

Introduction to Web Services Part III of the tutorial discusses Java EE 6 web services technologies. This book, these technologies include Java API for XML Web Services (JAX-WS) and Java API for RESTful Web Services (JAX-RS). Web service is a way of communication that allows interoperability between different applications on different platforms, for example, a Java based application on Windows can communicate with a.Net based one on Linux. The Java API for XML Web Services (JAX-WS) is the centerpiece of a newly rearchitected API stack for Web services, the so-called 'integrated stack' that includes JAX-WS 2.0, JAXB 2.0, and SAAJ 1.3. The integrated stack represents a logical rearchitecture of Web services functionality in the Java WSDP. Web service is a technology to communicate one programming language with another. For example, java programming language can interact with PHP and.Net by using web services. In other words, web service provides a way to achieve interoperability.

1. Web Services Javatpoint
2. Web Services Java Examples
3. Web Services Java Rest

A list of web service frameworks:

See also[edit]

Notes[edit]

This chapter provides an overview of database Web services and discusses how to call existing Web services. This chapter contains the following sections:

Overview of Database Web Services

Web services enable application-to-application interaction over the Web, regardless of platform, language, or data formats. The key ingredients, including Extensible Markup Language (XML), Simple Object Access Protocol (SOAP), Web Services Description Language (WSDL), and Universal Description, Discovery, and Integration (UDDI), have been adopted across the entire software industry. Web services usually refer to services implemented and deployed in middle-tier application servers. However, in heterogeneous and disconnected environments, there is an increasing need to access stored procedures, as well as data and metadata, through Web services interfaces.

The Database Web services technology is a database approach to Web services. It works in the following two directions:

• Accessing database resources as a Web service

• Consuming external Web services from the database Australian online pokies.

Oracle Database can access Web services through PL/SQL packages and Java classes deployed within the database. Turning Oracle Database into a Web service provider leverages investment in Java stored procedures, PL/SQL packages, predefined SQL queries, and data manipulation language (DML). Conversely, consuming external Web services from the database, together with integration with the SQL engine, enables Enterprise Information Integration.

Using Oracle Database as Web Services Provider

Web Services use industry-standard mechanisms to provide easy access to remote content and applications, regardless of the platform and location of the provider and implementation and data format. Client applications can query and retrieve data from Oracle Database and call stored procedures using standard Web service protocols. There is no dependency on Oracle-specific database connectivity protocols. This approach is highly beneficial in heterogeneous, distributed, and disconnected environments.

You can call into the database from a Web service, using the database as a service provider. This enables you to leverage existing or new SQL, PL/SQL, Java stored procedures, or Java classes within Oracle Database. You can access and manipulate database tables from a Web service client. Akvis noise buster 10 0 2925 13670 download free.

Web Services Javatpoint

This section covers the following topics:

How to Use JPublisher for Web Services Call-Ins

You can use JPublisher to generate Java wrappers that correspond to database operations and deploy the wrappers as Web services in Oracle Application Server.

Figure 12-1 illustrates how you use JPublisher to publish PL/SQL packages, SQL objects, collections, and packages as Java classes. Once published, these classes can be accessed by any Web service through an Oracle Application Server Containers for J2EE (OC4J) Web services servlet.

See Also:

Features of Oracle Database as a Web Service Provider

Using Oracle Database as a Web service provider offers the following features:

• Enhances PL/SQL Web services

  Improves PL/SQL Web services by extending the Web services support for additional PL/SQL types, including CLOB, BLOB, XMLTYPE, REF CURSOR, and PL/SQL records and tables. This enables you to use most of your existing PL/SQL packages as Web services.

• Exposes Java in the database as Web services

  Exposes existing Java classes deployed in Oracle Database as Web services. Java classes implementing
  

Web Service Data Sources (Virtual Table Support)

Focus professional 1 10 0. To access data that is returned from single or multiple Web service invocations, create a virtual table using a Web service data source. This table lets you query a set of returned rows as though it were a table.

The client calls a Web service and the results are stored in a virtual table in the database. You can pass result sets from function to function. This enables you to set up a sequence of transformation without a table holding intermediate results. To reduce memory usage, you can return the result set rows, a few at a time, within a function.

By using Web services with the table function, you can manipulate a range of input values from single or multiple Web services as a real table. In the following example, the inner SELECT statement creates rows whose columns are used as arguments for calling the CALL_WS Web service call-out.

The table expression in the preceding example can be used in other SQL queries, for constructing views, and so on.

Figure 12-3 illustrates the support for virtual table.

Figure 12-3 Storing Results from Request in a Virtual Table

Features of Oracle Database as a Web Service Consumer

Using Oracle Database as a Web service consumer provides the following features:

• Consuming Web services form Java

  Provides an easy-to-use interface for Web services call-outs, thereby insulating developers from low-level SOAP programming. Java classes running in the database can directly call external Web services by using the previously loaded Java proxy class or through dynamic invocation.

• Consuming Web services from SQL and PL/SQL

  Enables any SQL-enabled tool or application to transparently and easily consume dynamic data from external Web services. After exposing Web services methods as Java stored procedures, a PL/SQL wrapper on top of a Java stored procedure hides all Java and SOAP programming details from the SQL client.

• Using Web services data source

  Enables application and data integration by turning external Web service into a SQL data source, making the external Web service appear as regular SQL table. This table function represents the output of calling external Web services and can be used in a SQL query.

Overview of JPublisher Generation

JPublisher can receive the WSDL file from a Web service and create the static Java, proxy class, or PL/SQL call specification.

https://climledloda1989.wixsite.com/downloadgsm/post/macpilot-9-0-8. Figure 12-4 illustrates creating Web Services Call-Out Stubs.

Figure 12-4 Creating Web Services Call-Out Stubs

This support is created through the following JPublisher key options:

• -proxywsdl=url

  Use this option to generate JAX-RPC static client proxies, given the WSDL document at the specified URL. This option generates additional wrapper classes to expose instance methods as static methods and generates PL/SQL wrappers. It performs the following steps:

  1. Generates JAX-RPC client proxy classes.

  2. Generates wrapper classes to publish instance methods as static methods.

  3. Generates PL/SQL wrappers for classes that must be accessible from PL/SQL.

  4. Loads generated code into the database.

  Note:

  The -proxywsdl option uses the -proxyclasses option behind the scenes for steps 2 and 3, and takes the -proxyopts setting as input.

  Once generated, your database client can access the Web service through PL/SQL using the call specifications or through the JAX-RPC client proxy classes. The PL/SQL wrappers use the static methods. A client would not normally access any Web service using the static method directly.

• -httpproxy=proxy_url

  Where WSDL is accessed through a firewall, use this option to specify a proxy URL to use in resolving the URL of the WSDL document.

• -proxyclasses=class_list

  For Web services, this option is used behind the scenes by the -proxywsdl option and is set automatically, as appropriate. In addition, you can use this option directly, for general purposes, any time you want to create PL/SQL wrappers for Java classes with static methods, and optionally to produce wrapper classes to expose instance methods as static Simbooster premium 2 9 9. methods.

  The -proxyclasses option accepts the -proxyopts Parallels desktop 11 windows 10. setting as input.

• -proxyopts=wrapper_specifications

  This option specifies JPublisher behavior in generating wrapper classes and PL/SQL wrappers, usually, but not necessarily, for Web services. For typical usage of the -proxywsdl option, the -proxyopts default setting is sufficient. In situations where you use the -proxyclasses option directly, you may want to use the special -proxyopts settings.

• -endpoint=Web_services_endpoint

  Use this option in conjunction with the -proxywsdl option to specify the Web services endpoint.

• -sysuser=superuser_name/superuser_password Simplemind 1 13 0 download free.

  Use this option to specify the name and password for the superuser account used to grant permissions for the client proxy classes to access Web services using HTTP.

Adjusting the Mapping of SQL Types

Features of Oracle Database as a Web Service Consumer

Using Oracle Database as a Web service consumer provides the following features:

• Consuming Web services form Java

  Provides an easy-to-use interface for Web services call-outs, thereby insulating developers from low-level SOAP programming. Java classes running in the database can directly call external Web services by using the previously loaded Java proxy class or through dynamic invocation.

• Consuming Web services from SQL and PL/SQL

  Enables any SQL-enabled tool or application to transparently and easily consume dynamic data from external Web services. After exposing Web services methods as Java stored procedures, a PL/SQL wrapper on top of a Java stored procedure hides all Java and SOAP programming details from the SQL client.

• Using Web services data source

  Enables application and data integration by turning external Web service into a SQL data source, making the external Web service appear as regular SQL table. This table function represents the output of calling external Web services and can be used in a SQL query.

Overview of JPublisher Generation

JPublisher can receive the WSDL file from a Web service and create the static Java, proxy class, or PL/SQL call specification.

https://climledloda1989.wixsite.com/downloadgsm/post/macpilot-9-0-8. Figure 12-4 illustrates creating Web Services Call-Out Stubs.

Figure 12-4 Creating Web Services Call-Out Stubs

This support is created through the following JPublisher key options:

• -proxywsdl=url

  Use this option to generate JAX-RPC static client proxies, given the WSDL document at the specified URL. This option generates additional wrapper classes to expose instance methods as static methods and generates PL/SQL wrappers. It performs the following steps:

  1. Generates JAX-RPC client proxy classes.

  2. Generates wrapper classes to publish instance methods as static methods.

  3. Generates PL/SQL wrappers for classes that must be accessible from PL/SQL.

  4. Loads generated code into the database.

  Note:

  The -proxywsdl option uses the -proxyclasses option behind the scenes for steps 2 and 3, and takes the -proxyopts setting as input.

  Once generated, your database client can access the Web service through PL/SQL using the call specifications or through the JAX-RPC client proxy classes. The PL/SQL wrappers use the static methods. A client would not normally access any Web service using the static method directly.

• -httpproxy=proxy_url

  Where WSDL is accessed through a firewall, use this option to specify a proxy URL to use in resolving the URL of the WSDL document.

• -proxyclasses=class_list

  For Web services, this option is used behind the scenes by the -proxywsdl option and is set automatically, as appropriate. In addition, you can use this option directly, for general purposes, any time you want to create PL/SQL wrappers for Java classes with static methods, and optionally to produce wrapper classes to expose instance methods as static Simbooster premium 2 9 9. methods.

  The -proxyclasses option accepts the -proxyopts Parallels desktop 11 windows 10. setting as input.

• -proxyopts=wrapper_specifications

  This option specifies JPublisher behavior in generating wrapper classes and PL/SQL wrappers, usually, but not necessarily, for Web services. For typical usage of the -proxywsdl option, the -proxyopts default setting is sufficient. In situations where you use the -proxyclasses option directly, you may want to use the special -proxyopts settings.

• -endpoint=Web_services_endpoint

  Use this option in conjunction with the -proxywsdl option to specify the Web services endpoint.

• -sysuser=superuser_name/superuser_password Simplemind 1 13 0 download free.

  Use this option to specify the name and password for the superuser account used to grant permissions for the client proxy classes to access Web services using HTTP.

Adjusting the Mapping of SQL Types

Although Oracle Application Server does not currently support LOB types, XMLTYPE, REF CURSORS, and OUT and IN OUT arguments, you can use an alternative approach to expose PL/SQL methods and SQL types as Web services.

You can change the default action of JPublisher to generate code that uses a user-provided subclass. For example, if you have a PL/SQL method that returns a REF CURSOR, then JPublisher automatically maps the return type to java.sql.ResultSet. However, this ResultSet type cannot be published as a Web service. To solve this, create a new method that can return the result set in a Web service-supported format, as follows:

After creating a method, create an interface that contains the exact methods to publish. You can use JPublisher to easily accomplish this mapping by using the following command:

In the preceding command:

Web Services Java Examples

• MyApp contains the method to return the result set.

• MyAppInterf is the interface that contains the method to publish.

Web Services Java Rest

After translating the code for your application, archive all the class files into a single Java Archive (JAR) file and use the Web Services Assembler to create a deployable Web service Enterprise Archive (EAR) file.