Example usage for java.net JarURLConnection connect

Introduction

In this page you can find the example usage for java.net JarURLConnection connect.

Prototype

public abstract void connect() throws IOException;

Source Link

Document

Opens a communications link to the resource referenced by this URL, if such a connection has not already been established.

Usage

From source file:org.apache.jasper.compiler.TagLibraryInfoImpl.java

/**
 * Constructor.//w  w  w .j  av a2s.c  o m
 */
public TagLibraryInfoImpl(JspCompilationContext ctxt, ParserController pc, String prefix, String uriIn,
        String[] location, ErrorDispatcher err) throws JasperException {
    super(prefix, uriIn);

    this.ctxt = ctxt;
    this.parserController = pc;
    this.err = err;
    InputStream in = null;
    JarFile jarFile = null;

    if (location == null) {
        // The URI points to the TLD itself or to a JAR file in which the
        // TLD is stored
        location = generateTLDLocation(uri, ctxt);
    }

    try {
        if (!location[0].endsWith("jar")) {
            // Location points to TLD file
            try {
                in = getResourceAsStream(location[0]);
                if (in == null) {
                    throw new FileNotFoundException(location[0]);
                }
            } catch (FileNotFoundException ex) {
                err.jspError("jsp.error.file.not.found", location[0]);
            }

            parseTLD(ctxt, location[0], in, null);
            // Add TLD to dependency list
            PageInfo pageInfo = ctxt.createCompiler().getPageInfo();
            if (pageInfo != null) {
                pageInfo.addDependant(location[0]);
            }
        } else {
            // Tag library is packaged in JAR file
            try {
                URL jarFileUrl = new URL("jar:" + location[0] + "!/");
                JarURLConnection conn = (JarURLConnection) jarFileUrl.openConnection();
                conn.setUseCaches(false);
                conn.connect();
                jarFile = conn.getJarFile();
                ZipEntry jarEntry = jarFile.getEntry(location[1]);
                in = jarFile.getInputStream(jarEntry);
                parseTLD(ctxt, location[0], in, jarFileUrl);
            } catch (Exception ex) {
                err.jspError("jsp.error.tld.unable_to_read", location[0], location[1], ex.toString());
            }
        }
    } finally {
        if (in != null) {
            try {
                in.close();
            } catch (Throwable t) {
            }
        }
        if (jarFile != null) {
            try {
                jarFile.close();
            } catch (Throwable t) {
            }
        }
    }

}

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From source file:org.tinygroup.jspengine.compiler.TagLibraryInfoImpl.java

/**
 * Constructor which builds a TagLibraryInfoImpl by parsing a TLD.
 *//* w  w  w  . ja  v a2  s . c om*/
public TagLibraryInfoImpl(JspCompilationContext ctxt, ParserController pc, String prefix, String uriIn,
        String[] location, ErrorDispatcher err) throws JasperException {
    super(prefix, uriIn);

    this.ctxt = ctxt;
    this.parserController = pc;
    this.pageInfo = pc.getCompiler().getPageInfo();
    this.err = err;
    InputStream in = null;
    JarFile jarFile = null;

    if (location == null) {
        // The URI points to the TLD itself or to a JAR file in which the
        // TLD is stored
        location = generateTLDLocation(uri, ctxt);
    }

    try {
        if (!location[0].endsWith("jar")) {
            // Location points to TLD file
            try {
                in = getResourceAsStream(location[0]);
                if (in == null) {
                    throw new FileNotFoundException(location[0]);
                }
            } catch (FileNotFoundException ex) {
                err.jspError("jsp.error.file.not.found", location[0]);
            }
            parseTLD(ctxt, location[0], in, null);
            // Add TLD to dependency list
            PageInfo pageInfo = ctxt.createCompiler(false).getPageInfo();
            if (pageInfo != null) {
                pageInfo.addDependant(location[0]);
            }
        } else {
            // Tag library is packaged in JAR file
            try {
                URL jarFileUrl = new URL("jar:" + location[0] + "!/");
                JarURLConnection conn = (JarURLConnection) jarFileUrl.openConnection();
                conn.setUseCaches(false);
                conn.connect();
                jarFile = conn.getJarFile();
                ZipEntry jarEntry = jarFile.getEntry(location[1]);
                in = jarFile.getInputStream(jarEntry);
                parseTLD(ctxt, location[0], in, jarFileUrl);
            } catch (Exception ex) {
                err.jspError("jsp.error.tld.unable_to_read", location[0], location[1], ex.toString());
            }
        }
    } finally {
        if (in != null) {
            try {
                in.close();
            } catch (Throwable t) {
            }
        }
        if (jarFile != null) {
            try {
                jarFile.close();
            } catch (Throwable t) {
            }
        }
    }

}

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